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Calculated MPG vs. Indicated MPG of the c - Please post your results

Discussion in 'Prius c Fuel Economy' started by F8L, Mar 11, 2012.

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  1. F8L

    F8L Protecting Habitat & AG Lands

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    I would like for Prius c owners to please post the results of their mpg observations. This is meant as a way for prospective buyers to gain insight in the c mpg capabilities given different conditions. We often field a large number of posts from new owners asking if their mpg numbers are normal. This thread could help them determine whether their numbers abnormal or not by comparing with other owners who drive in similar conditions. This is also a good place to brag about your best tank! I encourage you to use the Fuelly.com website for keeping track of your mpg, total fuel usage and costs. It can be very helpful in tracking trends in mpg, fuel cost or changes you have made in driving style or mods.

    Please list your results using the following format:

    Year of vehicle:
    Date:
    Miles driven:
    Gallons Pumped:
    Hand-Calculated MPG:
    Displayed MPG:
    Average Speed:
    Tire Size / Wheel size:
    Tire Brand / Model:
    Tire PSI (Front / Back):
    Seasonal Conditions: (please include A/C usage and temp setting if applicable)
    Commute Length:
    Hypermiling Techniques:
    Other: (this could explain why a tank was bad or good or other unusual conditions like a rain storm, new tires, lots of short trips, etc.)
     
    #1 F8L, Mar 11, 2012
    1 person likes this.
  2. Sunkiss'd C

    Sunkiss'd C Junior Member

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    I'm trying to get real world numbers from my C b/c I'm curious how accurate the ratings and MID are. But I've had it for about a week and driving daily, but have not even reached half a tank yet!
     
    #2 Sunkiss'd C, Mar 13, 2012
  3. F8L

    F8L Protecting Habitat & AG Lands

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    That's a good thing. :)
     
    #3 F8L, Mar 13, 2012
  4. formula

    formula Member

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    sounds good to me. my C is coming from Japan. lol should be here soon.

    just filled up my civic. $50 bucks a week.
     
    #4 formula, Mar 13, 2012
  5. Sunkiss'd C

    Sunkiss'd C Junior Member

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    Who would've thought we'd see the days where it costs $50 to fill a freaking civic?:(
     
    #5 Sunkiss'd C, Mar 14, 2012
  6. formula

    formula Member

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    that is right. lol I feel sorry to those who drive hummer.
     
    #6 formula, Mar 14, 2012
  7. James9567

    James9567 New Member

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    i dont feel sorry for hummer owners with gas prices,its there choice to drive a tank,lol.... horayy for prius c........
     
    #7 James9567, Mar 15, 2012
    Beelzel and -CC- like this.
  8. revhigh

    revhigh MPG Enthusiast

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    I don't .... one of the stupidest vehicles ever made ... typical gm garbage.

    REV
     
    #8 revhigh, Mar 15, 2012
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  9. alfon

    alfon Senior Member

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    Why is it that no Prius C owners have posted in
    this forum format. I am sure by now somebody
    has sufficient data.
     
    #9 alfon, Mar 15, 2012
    1 person likes this.
  10. manamania

    manamania New Member

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    Just go to Fuelly.com. There are loads of data.
     
    #10 manamania, Mar 15, 2012
  11. alfon

    alfon Senior Member

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    Just checked Fuelly only the regular Prius and the
    Prius V are listed, no Priuc C.
     
    #11 alfon, Mar 15, 2012
  12. F8L

    F8L Protecting Habitat & AG Lands

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    That misses the point. :)

    Please see the threads in the GenIII and v forums. Believe it or not this type of thread is helpful for those who know what they are looking for. Fuelly just doesn't cover everything we need for analysis.
     
    #12 F8L, Mar 15, 2012
  13. manamania

    manamania New Member

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    I see. I thought that's the one for Prius C.
    2012 Toyota Prius MPG Reports | Fuelly
    Sorry about that.
     
    #13 manamania, Mar 15, 2012
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  14. sameasbeforebut

    sameasbeforebut New Member

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    [​IMG]

    Prius c Four w/ 16" wheels.
    Driven 488 miles on tankful #1 (averaged 59 mpg); 80% New England highway miles (drive 50 miles each way between work and home).
    Tankful #2 so far is just over 420 miles (with just under 3 gallons remaining).
    --So far, both tanks have been driven in ECO mode.
    Back roads average between 60s and 70s (mpg).
    Highways NEVER below 45 mpg, and seem to average 51 mpg.

    Next tankful experiment: How far without using ECO at all?
     
    #14 sameasbeforebut, Mar 18, 2012
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  15. Codyroo

    Codyroo Senior Member

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    Yes, but the point of this thread is to see if the Indicated MPG (the digital readout on your dashboard) is equal to the calculated MPG (miles driven/gallons of gasoline). On the Gen III, there is approximately a 5 - 6% error between the two (i.e. if the indicated MPG is 50.0 mpg on the display, the actual calculated MPG is around 47.5).
     
    #15 Codyroo, Mar 19, 2012
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  16. alfon

    alfon Senior Member

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    I agree our Prius is consistently off by 3 - 3.5 mpg over
    reading. It would be nice if we can accumlate more
    data on the Prius C to confirm if indeed the computer
    is accurate as Wayne Gerdes from Cleanmpg.com
    stated when he test drove the Prius C and stated
    it was within .06 % accurate when he obtained
    85 mpg.
     
    #16 alfon, Mar 19, 2012
  17. Codyroo

    Codyroo Senior Member

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    On Fuelly, there is one 2012 Prius C shown, and with 2 of 3 fuel ups, they listed the indicated MPG. It appears that the error is ~4% high (something like 3.7% and 3.9%).

    http://www.fuelly.com/driver/wx4gps/prius-c
     
    #17 Codyroo, Mar 19, 2012
  18. Kirkuleez

    Kirkuleez New Member

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    Filled up today, car indicates an aveage of 53.4 mpg's. 433.9 miles divided by 8.463 gallons = 51.27 actual mpg's. That's close to 4% off. I am still very happy with those mpg's though. It was probably about just a little over half highway and the rest city.
     
    #18 Kirkuleez, Mar 19, 2012
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  19. vinnie97

    vinnie97 Whatever Works

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    Hope that 0.6% accuracy reported by the reviewer wasn't just a fluke. :mad:
     
    #19 vinnie97, Mar 19, 2012
  20. F8L

    F8L Protecting Habitat & AG Lands

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    If everyone were to top off in the same manner as Wayne did then I think the GenIII accuracy would be significantly reduced as well. Visual confirmation would eliminate at least one of the variables. Then you would just have to hope the pump is accurate. :)

    Kirkuleez, thank you for posting your last tank. 4% is not too bad. Eventually more Prius c owners will understand why we are so interested in following the format I outlined and this thread will become more organized and informative just like the others have become. Thanks again for your contribution. :rockon:
     
    #20 F8L, Mar 19, 2012
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