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Driving in the ECO Mode?

Discussion in 'Prius c Fuel Economy' started by South_Bay_Surfer, Mar 25, 2012.

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  1. South_Bay_Surfer

    South_Bay_Surfer New Member

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    Hello,

    I just purchased a 2012 Prius III yesterday and I am loving it. Do you drive your Prius in Eco mode? The dealership said I probably would never need to use the button in the City but that does not make too much sense to me. How much gas does this save going this route then without it depressed?
    JMD likes this.
  2. luthyone

    luthyone New Member

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    I have just over 200 miles on my C. ECO mode modulates energy used by the climate control system and adjusts throttle responses to promote efficiency. If you drive a prius to obtain the best possible mpgs then you probably will be light on the throttle and have the climate control off for most of your trip so the ECO mode may not be needed. I drove my C for the first 200 miles just like I drove my truck, hard. I took my family of 5 on two 50 mile round trips with eco mode off and speeds of 55-75 mph. I averaged 42 mpg. Now I have eco mode on and no one in the car with me and I should do much better. The fun is testing everything for yourself!
  3. South_Bay_Surfer

    South_Bay_Surfer New Member

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    Thank you Luthyone. I am looking forward to learning this vehicle. I owned a Cadillac STS in the past and I love this Prius wayyyyyyyyy more only 1 day into it. I dig the entune in the vehicle and currently linking Pandora up to it.
  4. PriusofDoom

    PriusofDoom New Member

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    I only have 150 miles on mine so far, but I've never taken ECO mode off. I havent seen a time when it was needed. Just going up/down seattle hills seems to modulate the engine enough that I'm not 'maintaining a constant speed'.
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  5. SquallLHeart

    SquallLHeart The Techie Guy

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    I leave my car always in ECO mode unless I really, really, really need to accelerate quickly. Even with Eco mode on, punching the gas has given me enough acceleration for most situations.
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  6. Oldwolf

    Oldwolf Prius Enthusiast

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    Does ECO mode prevent throttle modulation while in cruise and climbing a hill? Thanks.
  7. outhouse

    outhouse Member

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    to a point, not completely.


    im experimenting with hills and eco mode. On the freeway it really helps.


    steep hills not so much, but im on my third tank of gas and seeing whats easier to maintain 50mpg.

    with eco off, you can jack rabbit foward a little quicker while being in power, so in some cases eco will drink more gas
  8. qbee42

    qbee42 My other car is a boat

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    ECO mode has the same acceleration as Power mode. Power mode feels faster, since you get more power earlier in the accelerator pedal, but it all evens out when you get to the end.

    Tom
  9. kreandeau

    kreandeau New Member

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    Hello - I just bought a new Prius C3, I just have a general question, there are (2) buttons near the shifter (ECO/EV) that can be manually pushed... my question, will the car automatically go between Power/ECO/EV mode, or is this something I should do manually? Should I always have the ECO mode button turned on or will the car do this on its own? Any insight would be greatly appreciated!
  10. HaveNoCents

    HaveNoCents Conservative Tree Hugger

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    For all practical purposes just leave it in Eco mode. I would avoid EV mode at all costs. One may think he is increasing mpg by using it, but he is not. The quicker the battery drains the sooner you need the motor to recharge it.
  11. Dark_matter_doesn't

    Dark_matter_doesn't Prius Tinkerer

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    The vehicle won't automatically toggle between the three (actually, four with "Normal mode" which is nothing selected). Lots of people just leave it in ECO mode for best mileage, including me. I toggle to Power mode occasionally for quicker response, like on my favorite on-ramps and when I like to embarrass BMWs off the line.
  12. hoddy4

    hoddy4 New Member

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    Based on my experience with a Prius v, you'll get your best performance both mileage wise and performance by keeping it in the Power Mode.
  13. d1morgj0

    d1morgj0 Junior Member

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    Based on my experience with a Prius v, you'll get your best performance both mileage wise and performance by keeping it in the Power Mode....

    Said "power mode" does not exist on the Prius C......
  14. HaveNoCents

    HaveNoCents Conservative Tree Hugger

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    Although I am finding your statement to be true, there absolutely have to be conditions where this will not be true. If power mode was the best under all conditions Toyota would make it the default mode. I'd be willing to guess that in heavy traffic with the a/c on would be one of those conditions where power mode would eat your lunch.
  15. hoddy4

    hoddy4 New Member

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    Certainly is counter intuituive, but until I find the conditions where it doesn't apply, I'm sticking to the Power mode. I'd also encourage others to try it so that we find out what is actually going on. At this point, it's hard to say why Toyota doesn't have it as the default. It could be that under EPA testing conditions it doesn't perform as well. One thing that really surprised me the other day was when I took a 4 mile round trip to the grocery store in the Power mode. I got over 57mpg on a trip I had never gotten over around 47mpg. This was is the morning when the battery was at its lowest. I would have bet the mileage should have been lower.
  16. HaveNoCents

    HaveNoCents Conservative Tree Hugger

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    Yeah I tried two exact same trips yesterday and power mode got 56 mpg and Eco got 52.1. I'm about to test it on the same trip one more time from a cold start first drive of the day point of view.
  17. maverickf

    maverickf New Member

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    I got my C3 on last Sunday for commute, 10% local and 90% hwy (55-70mph). I have been sticking with ECO mode and getting 55mpg. I definitely will try more local driving during the weekend.
  18. BrunoPuntzJones

    BrunoPuntzJones Member

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    I find I get better (displayed MPG) in "power" mode versus Eco mode. I figure it's that I'm able to get up to speed faster, and then coast quicker. Spending less time at a higher RPM must use less fuel than more time at a lower RPM.
  19. HaveNoCents

    HaveNoCents Conservative Tree Hugger

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  20. fgp

    fgp Member

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    squall, what do you think about leaving it in eco and going a long trip that includes somewhat mountainous driving like up lookout mountain near chattanooga, folowed by flat on the way to florida. could you leave it in cruise control. would you be able to just drive without cruise. i respect your opinion thatw why i ask:confused::confused:
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