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DOE New Website Compares EV vs. ICE Fuel Costs

Discussion in 'Energy, Environment, and Policy' started by Beavis, Jun 12, 2013.

  1. Beavis

    Beavis Signature 991

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  2. stevezzzz

    stevezzzz R;SigS;P85D;SigX

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    From the DOE's methodology PDF (pardon the lack of formatting):

    eGallon Methodology

    The eGallon is measured as an “implicit” cost of a gallon of gasoline. It is calculated by multiplying the average U.S. residential electricity price (EP) by the average comparable passenger car adjusted combined fuel economy (FE) by the average fuel consumption of popular electric vehicles (EC), as follows:

    eGallon ($/gal) = FE * EC * EP

    where

    FE = the average comparable passenger car adjusted combined fuel economy, miles/gallon
    EC = the average electricity consumption (kWh/mi) of the top 5 selling PEVs in the U.S.,
    and
    EP = the average U.S. electricity price, $/kWh.

    For instance, if the average comparable 2012 passenger car adjusted combined fuel economy, mi/gal is 28.2 mi/gal and the average efficiency for the top selling U.S. EV brands in 2012 is .35kwh/mi, the price of an e-gallon would be:

    28.2 mi/gal * .35 kWh/mi * .1233 $/kWh = $1.22/gal

    In other words, it costs about $1.22 to drive an EV the same distance that a vehicle
    powered by an internal combustion engine (ICE) can go on a gallon of gasoline.


    I'll have to chew on this for awhile.
     
  3. brianman

    brianman Burrito Founder

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    Where does "average" come from? Is this a rolling metric, or is a snapshot taken once a year at a specific time so you have a rating like "eGallon2012"? Is it U.S. market vehicles?

    Just from a skim of the text this reads to me like statistic * statistic * statistic * statistic = garbage.
     
  4. stevezzzz

    stevezzzz R;SigS;P85D;SigX

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    I think the author of the web page was going for nothing more ambitious than showing newbies that it's cheaper to drive an EV than an ICE. You can roll your own value for cost per eGallon by substituting different values for comparable ICE mi/gal, EV kWh/mi, and your electricity cost per kWh.
     
  5. Doug_G

    Doug_G Lead Moderator

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    I don't see the point of this. Calculate cents per mile (km) for each and let the actually-real-world-comparable numbers stand for themselves.
     
  6. TXjak

    TXjak Owner/Investor/Advocate

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    I think it's more informative to consider miles per dollar.

    If my Model S can go 100 miles for $3.30 (30 kWh x $0.11 per kWh), that's $0.03 per mile, or 30 miles per dollar.
    If the ICE car goes 100 miles for $11.81 ((100 / 28.2 mpg) x $3.33), that's $0.12 per mile, or 8.5 miles per dollar.

    More like 4x in this case.
     

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