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Based on price of fuel vs electricity here, I got 110mpg-e today...got home with 8mi

Discussion in 'Model S: Battery & Charging' started by carrerascott, Mar 20, 2013.

  1. carrerascott

    carrerascott FUEL FTR

    Joined:
    Nov 15, 2012
    Messages:
    906
    Location:
    Charlottesville, Virginia
    Assuming $3.80 per gallon, and our electricity is 9.5c/kWh.

    I drove today from Charlottesville to Richmond and back. at the 40kWh point, I had gone just over 110 miles (40kWh = $3.80 in electricity here). Most of the driving was interstate between 70-80mph.

    I ended up home with 8 miles to spare, having traveled 173 miles (started with rated 238 or so). Definitely didn't drive conservatively which is why I would have gotten only 181 out of the full charge. I guess if I had driven 55-60 (but speed limit is 70) I would have gotten better mileage.

    It was 40-50F out, FYI.

    20130320_112527_resized.jpg 20130320_124647_resized.jpg
     
  2. jdesmo

    jdesmo Member

    Joined:
    Feb 17, 2013
    Messages:
    12
    Location:
    NYC
    For real life numbers, I would take into consideration charging efficiency (~84%), and vampire drain (~4KWH/day ). Assigning 63% of the daily vampire drain to the 110 mi section,That brings the total energy usage for that 110mi stretch to ~50KWH. That translates to ~88mpg, which is still very respectable. Here in Long Island, we pay $0.22/KWH, and premium grade is $4.50/Gal. That would translate to only 33mpg for that trip in your car!!!!!!!
     
  3. mknox

    mknox Well-Known Member

    Joined:
    Aug 7, 2012
    Messages:
    9,364
    Location:
    Toronto, ON
    Technically, MPGe has nothing to do with price. It represents the miles you can go on a unit of energy equivalent to a gallon of gas.

    One US gallon of gas has the same energy content as 33.7 kWh of electricity, so in an EV's case MPGe = Miles Per 33.7 kWh.
     
  4. Al Sherman

    Al Sherman It's about THIS car.

    Joined:
    Nov 29, 2012
    Messages:
    1,692
    Location:
    Batesville, IN
    True but just so Scott doesn't feel bad; his MPGe was still over 90. No?

    Ans he saved at least 15 bucks on the trip assuming a 20MPG ICE.
     

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