âEco Modeâ is a feature youâll find on many newer cars. In particular, American and East Asian manufacturers often include a button specifically for the purpose of turning on Eco Mode.
Itâs short for âEconomic Modeâ and represents the fact that youâll be burning less fuel. Thatâs kinder to your wallet in both the short and long term, thus âeconomicâ. Itâs also, as you can probably tell, better for the environment. (Or perhaps âless badâ would be a more accurate term.)
There are a couple of variants on the name, but weâll get into them a bit deeper into the article.
- What is Eco Mode?
- What does Eco Mode do?
- Eco Mode â On or Off?
- Eco Mode disadvantages
- How much money does Eco Mode save?
- Other engine modes
- Eco light/indicator
- FAQs
Eco Mode In Car
Eco Mode (also known by its other names â see further below) is an engine mode.
An engine mode, in turn, is an electronically-controlled way in which the engineâs normal running is adjusted. The ECU will change things such as the throttleâs responsiveness or the shift pattern of the transmission. More advanced versions, more commonly found on newer vehicles, will also work with the ignition timing and fuel quantities or the air-to-fuel ratio. A few will also work with the electrical system and air conditioning, reducing their load on the engine.
In Eco Mode, things are automatically adjusted for maximum fuel economy.
However, for example, in Sport Mode, the engineâs workings become more powerful.
Using Eco Mode is a good idea to keep your fuel costs as low as possible. Iâll go into how much you can expect to save later on.
So far, I mentioned a few common ways that engine modes adjust the way the engine functions. In Eco Mode, this leads to a better fuel economy.
All manufacturers build their engine modes differently. Because of this, no two are usually exactly the same and might affect different things:
What Does Eco Mode Do
- Throttle responsiveness â the throttle pedal (also known as the accelerator or gas pedal) controls how much air travels into the engine at any given moment. Itâs a bit like bellows for a fire if it helps to think of it that way. The more air comes in, the more powerful the combustion reaction will be. In the olden days, a wire controlled the throttle plate â nowadays, itâs a position sensor (TPS). The ECU takes this information onboard, still, but slows the response down slightly. If the throttle opens slower, you wonât use as much fuel to accelerate the car.
- Transmission shift pattern â for maximum fuel economy, the transmission should be in the highest gear logistically available at any given moment. It should also change gear as infrequently as possible. Since thereâs less going on here as well, the car might feel like itâs struggling more than usual with basic tasks. However, it will be saving fuel.
- Fuel quantities and air-to-fuel ratio â when you need to accelerate hard (for example), your air-to-fuel ratio becomes richer. That is, there is more fuel per unit of air than the optimum. This happens because richer mixtures tend to provide the engine with more power. However, itâs less efficient, not to mention worse for the environment. Turning Eco Mode on will keep the air-to-fuel ratio as low as possible, depending on your driving circumstances.
- Air conditioning and electrical systems â by essentially decreasing the effectiveness of the AC and less important electrical systems (such as the interior lights, heated windshield, radio, stereo, etc.), the car will have less to power. As a result, the fuel itâs burning is more effectively converted into power and sent to the wheels.
What Does Eco Mean On A Car
There are many other things that different car makers will incorporate into their individual programs. For example, the new Honda Accord models use cylinder deactivation (VCM: Variable Cylinder Management).
All of these adjustments will, inevitably, lead to the car feeling more sluggish to drive. Everything will feel sort of lazy â not unresponsive, by any means, but less responsive than when your vehicle is in other engine modes. Such is the price of saving money on fuel.
Honda calls its Eco Mode setting âECONâ. Itâs the same thing, essentially, just Hondaâs name for it.
Some cars from Kia/Hyundai call the setting âActive ECOâ â many still call it Eco Mode, though.
Other than that, âEco Modeâ is a reasonably unanimously used term across the automotive industry.
As this video from Kia shows, you activate it in different ways, depending on the vehicle. There is usually either a button directly for Eco Mode or for a wider selection of engine modes.
Eco Mode works very similarly to the overdrive system â the O/D button â especially if it works directly with the transmission. There are a few similarities as to how you should use the two. Check out an article on when to use overdrive here.
Driving In Eco Mode
In almost every situation, you can drive with Eco Mode on with no worries at all.
There are lots of people who suggest you should only use it here or there. In the majority of cases, that wonât be true. You can use Eco Mode pretty much all the time. Thereâs nothing wrong with having Eco Mode on. Your acceleration will be diminished, but itâll be far from nonexistent. There will be no need to turn it off to accelerate hard in most situations. For example, you shouldnât have any issue speeding up to merge onto a highway (unless the on-ramp is particularly short).
No matter whether youâre driving in the city or on the highway, youâll be saving gas â to some extent, at least. Itâs likely to have a more significant impact on your motor when youâre driving in the city with it on, but youâll see results wherever.
It would be best if you turned Eco Mode off in a few select situations.
- Whenever you need the car to be more responsive â for example, if you need to accelerate hard or youâre driving along a road where you need a high level of car control. Doing this will mean you have greater control of the car and, therefore, that youâre safer. A few cents of gas is more than worth the cost here.
- When youâre towing â the juryâs still somewhat out on this one, but there are a good many reports of transmissions having been ruined by engine modes and overdrives if theyâre used while youâre towing something. You should turn it off, so your car is at the very least responsive. It might also save damage to your transmission, depending on how advanced the Eco Mode system is.
Eco Mode Disadvantages
Unfortunately, there are always disadvantages. Here, though, they arenât anything more than what you might expect.
With vehicles â and, in fact, a lot of things â itâs well known that the slower you go, the fewer resources youâll use to get there. The vice versa is also true: the faster you want to go, the more resources youâll use. Itâs all related to terminal velocity and resistance and thermal properties of materials⊠not things worth getting into just now.
If you want to drive more economically â thus engaging Eco Mode â youâll need to drive slower and smoother. Smooth driving is good all-around â whether you want to go faster or slower â and well worth learning how to do correctly.
All Eco Mode does is, at its base level, force you to drive more like this. The car canât speed up as quickly, so you have to drive slower. It doesnât use as much power for other things, even though you might try to force it.
In essence, itâs no different from having a light right foot and turning all your other devices off.
The downside?
- Youâll be driving slower than you might like.
- The car wonât be as responsive as it usually feels.
- If the AC or electricals are affected, it might make you want to turn Eco Mode off.
These arenât so much the symptoms of Eco Mode as the symptoms of driving economically. If saving as much fuel as you can is what you need, you should be driving like this â with or without Eco Mode.
Does Eco Mode Save Gas
First of all, disclaimer: thereâs no real way to tell you this. We all drive differently. How we drive is actually what makes the most difference, rather than whether Eco Mode is turned on.
Most manufacturers estimate that youâll save approximately 5% on gas costs when using Eco Mode. The average American spends $5,000 per year on gas. This is much higher than itâs been in previous years (usually around $3,000 per year), owing to the sky-high gas prices as of late.
For the most accurate reading possible, I decided to run my own test.
Eco Mode Vs Normal Mode
First of all, this wasnât a test confirmed in scientific laboratory-style conditions â as much as I wish I had the resources to do that. (Has anyone got a spare test track?) Therefore, the results arenât necessarily 100% accurate and would likely be different if replicated.
Nevertheless, my findings were interesting.
The VW Golf TSI Bluemotion has an Eco Mode that increases fuel economy âby optimizing your engine and gearbox performance to save fuelâ. It also reduces the power draw of the air conditioning system.
In my experiment, another person and I took the Golf 10 miles down the road and then 10 miles back again, from Lichfield to Sutton Coldfield down the A38. This route involves a good mix of fast, (usually) open roads and more congested city driving.
Although you can get your hands on OBD plugins that monitor your carâs status and produce all sorts of weird and wonderful graphs, I donât currently have one. As such, I only had the carâs onboard âaverage trip mpgâ calculator to use.
The plan was to drive to Sutton to see what the average mpg was for that trip. We would do that in Normal Mode. Then, on the return journey, weâd put the car into Eco Mode and see what happened to its average mpg. If the average mpg went up, it would indicate that the journey was more economical in Eco Mode than Normal Mode. And, of course, vice versa would also be true.
Unfortunately, things didnât quite go smoothly, and the last 2 miles of the return journey were held up in a traffic jam which added about half an hour onto the journey time. The Golf, however, is fitted with a stop/start system, so we (unintentionally but unavoidably) incorporated that into the experiment.
Does Eco Mode Work
Here are the results.
The outward journey yielded an average of 41.8 mpg â in Normal Mode.
When returning, we pulled up with the car reading 44.1 mpg. That was in Eco Mode with the stop/start system on for the traffic jam.
Despite the jam, you can see that there was an increase in fuel economy. In percentage terms, Eco Mode led to 5.5% less fuel being burnt.
I was surprised by how close this number is to the 5% expected value from many manufacturers, but there you go.
As noted, those results arenât an accurate, repeatable, etc. scientific experiment. It was also affected by other unavoidable factors, such as the jam and potential minor differences in driving style between the trips. However, it was interesting to go through.
When Was Eco Mode First Introduced
The history of Eco Mode involves the history of all engine modes.
Some trace the development of engine modes back to overdrive. Overdrive systems were originally bolt-on extras to the transmission in a rear-wheel-drive car and were first seen in the 1930s and 1940s. The purpose was to reduce the amount of fuel used at high speeds (on highways) by âover gearingâ the gearbox (transmission) â that is, for the transmission output speed to be faster than the input speed.
Over time, this system developed from an aftermarket extra into an electronically-controlled gear system.
Many would alternatively argue that the first engines with alterable âmodesâ could be found on early Land Rovers, which first debuted in 1948. The second gear stick allowed drivers to shift the four-wheel-drive settings. This, in essence, altered the âmodeâ of the engine, meaning the driver could use it for different things in different situations.
Itâs hard to know, really, because each manufacturer went their own sort of way and then met up again in todayâs age. Many things could have inspired â partially or fully â engine modes. Undoubtedly, the greatest of these is the ever-increasing amount of electrical components within a car and the dependence on ECUs and sensors.
Over time, engine modes have become commonplace on many cars â especially in the last decade.
As well as Eco Mode, you will also likely find several other types of engine mode.
Sport Mode In Cars
Sport Mode is usually the opposite of Eco Mode in terms of engine performance.
Everything gets sharpened up. The throttle response becomes even more sensitive, and the air-to-fuel ratio might become richer. Youâll move faster, yes, but youâll be using more gas as a result.
My opinion on the whole matter â perhaps controversial, perhaps not â is that Sport Mode is actually the safest engine mode to drive with. Thatâs because everything is as responsive and as precise as possible. The car will react quicker to your input, and in emergency situations, those moments could be vital. However, yes, youâll be using more fuel. And if you choose to put it in Sport Mode and absolutely rag it⊠well, itâs not safe anymore!
It may also affect the suspension, tightening it up and sometimes making it unbearably juddery. If the engine mode affects the suspension, I usually wouldnât put it in Sport Mode. Unless youâre on a track, the stiffer suspension is unlikely to make any difference to your carâs performance whatsoever. And itâs just awfully uncomfortable. For long journeys, it would be a nightmare and cost you more in chiropractor visits than youâd ever save in fuel.
Comfort Mode In Cars
âComfortâ Mode might otherwise just be called ânormalâ.
Itâs what most manufacturers build their cars to be â day-to-day runners. If youâre just using your vehicle for everyday things like an average person â shopping, dropping the kids off at school, or visiting friends, comfort is probably your primary concern.
This mode is something in the middle between Eco Mode and Sport Mode. The suspension is generally relaxed (if altered at all), and everything is focused on the balance between everything. Decent performance and decent fuel economy, but the main aim is comfort. Creating a place you like to sit in.
Snow/Ice/Winter Mode In Cars
This engine mode is designed explicitly for slippy roads. Itâll force the car to drive in such a way as to minimize the risk of sliding.
Usually, Snow Mode will make the following adjustments:
- Throttle responsiveness is lowered in a similar way to Eco Mode. The slower the wheelâs speed changes, the less likely you are to lose traction.
- On the subject of traction, traction control is generally tightened up and put into a hyper-alert setting. Your grip is, therefore, maximized.
- Automatic transmissions select the highest possible gear so that everything is nice, gentle, and slow.
- Brakes become gentler, meaning youâre less likely to lock the wheels up. In snow or ice, itâs imperative to keep the wheels turning â otherwise, youâll have a very low coefficient of friction with the road, meaning stopping turns from a delicate squeeze into a panicked stamping affair with little in terms of results.
All of these combine to give you the best traction possible â vital in slippy conditions. You might also need to use this mode in heavy rain or where aquaplaning is a possibility.
Individual Mode In Cars
Most cars now feature this mode. It allows drivers to select and customize the settings they want.
Itâs helpful, to some extent. However, manufacturers put limits on exactly what you can do for safety reasons.
Eco Car Light
When you turn Eco Mode on, a light will illuminate somewhere to let you know whatâs going on.
However, many cars also have an âEcoâ light on the dashboard, often looking something like this.
This particular light is unrelated to Eco Mode. Itâs not a warning light, either.
When you see the Eco light appearing on the dashboard, itâs simply showing you that the car is driving pretty close to its maximum mpg. As such, youâre most likely to notice it when youâre traveling along empty, flat country roads at a constant, relatively low speed. In these situations, your engine is doing the minimum amount of work.
The light doesnât represent an engine mode. Itâs simply an indication that youâre driving economically â an invitation, if you will, to pat yourself on the back and give yourself a gold star. Other than that? Thereâs not really anything going on.
Itâs not a warning light, and thereâs nothing to worry about. Itâs just there â quite literally â to say âwell done.â
For more information on the Eco light, consult your ownerâs manual.
How To Save On Gas Car
In recent years, cars have become much more friendly to your wallet.
Here are just a few of the innovations that have led to more efficient dollar spending.
- Fuel injectors rather than carburetors.
- Exhaust Gas Recirculation (EGR).
- Improved tire patterns and treads.
- Hybrid systems â for example, kinetic energy recovery.
- Improved air conditioning systems.
- Advanced ECUs and computer programming.
- Specially designed body shapes to improve airflow and reduce drag coefficients.
- Smaller, forced induction (turbocharged/supercharged) engines.
- Diesel engines rather than gasoline (although, by the current trend, electric cars are soon to make diesel advances redundant).
- Weight-saving materials (aluminum, carbon fiber, etc.) and building techniques.
Eco Mode: In ConclusionâŠ
Overall, Eco Mode is a beneficial little gadget to have. It forces you to slow down and thus save money on gas.
For the best results, though, in my opinion, nothing can really beat learning to drive more economically yourself. Eco Mode â and programs like it â will certainly assist you and perhaps lead to even further savings, but thereâs little Eco Mode does that you couldnât do yourself.
- It reduces the throttle response â you could be more gentle with your foot instead. Doing this would also consequently affect the air-to-fuel ratio and amount of fuel used.
- Eco Mode reduces the power going to the AC and other electricals â turn them off.
- Driving gently and smoothly greatly improves fuel economy.
There are some things you canât change. For example, the shift patterns in an automatic transmission or the ECU-controlled air-to-fuel ratio. Thatâs where Eco Mode is beneficial, covering the things that we canât.
It would be best if you drove with Eco Mode on as much as you can to save money on gas.
Thanks for reading!
FAQs On Eco Mode
If youâd like to learn more about the Eco Mode in your car, our FAQs here might helpâŠ
What Does Econ Button Do
In some cars, you might notice an ECON button. This is especially so if you own a Honda, with that bright green ECON button accompanied by a small tree icon. Pressing the ECON button essentially activates your carâs Eco Mode. Basically, this adjusts your carâs powertrain management settings to be more biased towards fuel economy rather than outright performance. In so doing, your carâs internal computer would adjust the throttle response, transmission gearing, and even the cruise control or in some cases, the A/C, as well. This is all to ensure that your car is using as little of its engine as possible, thus allowing you to eke out more MPGs.
Does EcoChip Really Work
There are plenty of supposed fuel-saving accessories and gadgets that you can buy online. One of the most popular ones is the EcoChip, which is a little dongle that you plug into your OBD port. Apparently, this little brick is supposed to monitor and analyze your carâs behavior and re-tune its ECU or PCM (basically, your carâs computer). As such, these changes to the powertrain management are designed to help save you fuel by better optimizing your car. However, none of these devices â including the EcoChip â have ever been proven to work, nor would they save you any fuel. Every user who has reviewed them extensively definitively calls these EcoChip-like devices an outright scam.
Does Driving Slow Save Gas
Thereâs a common misconception that driving more slowly can save you gas. However, this isnât always true. While youâre driving slowly, your carâs transmission would optimally kick it into a lower gear to ensure that you have adequate performance for maneuvering. Although, this also means that your engine will run at higher RPMs, causing it to burn more fuel to keep it running. Conversely, driving too fast would mean that youâre fighting against the rolling resistance of your tires and drag from the air. This too would cause your MPGs to drop. The key to optimizing for lower fuel consumption is being steady on the gas pedal. Thus, avoiding aggressive accelerating, sudden braking, and making sure that you maintain a constant speed. Usually, 50 to 60mph is the most optimal speed to try and maximize MPGs.
What Does Eco Mean On AC
While your car has an ECO or ECON mode to manage and better optimize the powertrain for higher fuel economy, the A/C system might also include its own Eco Mode. You might also see this Eco Mode setting on regular household air conditioners, too. In essence, the Eco Mode in a carâs AC system could better optimize the usage of the A/C unit to help save a bit of fuel, as AC does take quite a bit of engine power to run. Usually, this Eco Mode setting would turn off the AC compressor (among other components) to reduce the load on the engine. Instead of producing chilly air, the AC unit would now do its best to recirculate cold air from the cabin, mixing in with outside air when needed. Thus, aiding in further improving your fuel economy.
Does Sport Mode Use More Gas
In short, yes, turning on the Sport Mode setting on your car will use more gas. Once you activate Sport Mode, it will tell your carâs powertrain management system to focus more on performance and sporty driving. This will alter how your car behaves. Mostly, it would sharpen throttle response (often by dumping in more fuel into the engine), or tweak the transmission gearing to shift faster and more sharply. Even the throttle pedal might be recalibrated to be more responsive upon pressing it, among other smaller changes. These alterations ultimately yield more performance from your car. But it would come at the cost of increased fuel economy, and added long-term wear and tear (albeit itâs not significant) to your carâs componentry.
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Does Eco Mode reduce automatic backup speed?
Hi Randy, no eco mode will have no effect at all on back up speed.