You'd think that the psychologists would also realize that gallons per mile
would be far less meaningful to Joe Schmo than gallons per 100 miles, as I
could see most of my neighbors say "0.083 gallons per mile versus 0.071, what's
the difference.? Why would I trade down to a smaller truck to save one
hundredth of a gallon?!".
Tell him that he'll save 1.2 gallons per 100 miles, and he'll say, "Okay,
that's nearly ten bucks a week- "I can visit Cowgirl Coffee every morning with
that!"
Tell him that he'll save 119 gallons per year (or 143 gallons for the
oft-quoted 12k miles per year avg vehicle), and that might make an actual
difference in buying behavior.
In EV terms, I still prefer for Wh/mile. That's the only way my iMiev looks
better than a Model S.
-Jay Donnaway
Message: 3
Date: Tue, 26 Mar 2013 07:55:25 -0700 (PDT)
From: tomw <
To: [email protected]
Subject: Re: [EVDL] EVLN: 10 questions for a Ford electrification
expert
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
There was an article in a 2008 issue of /Science/ by psychologists Richard
Larrick and Jack Soll entitled ?The MPG Illusion?. They gave the following
example to illustrate that the mpg frame gives poor guidance for costs:
Bill trades in a vehicle which gets 12 mpg for one that gets 14 mpg. David
trades in one that gets 30 mpg for one that gets 40 mpg. David reduced his
mpg by 1/3, whereas Bill reduced his by only 1/6, half as much, so it seems
to many that David will save more gas.
However, if both cars travel 10,000 miles in the same conditions over a year
Bill will reduce his gas consumption from 833 gallons to 714, saving 119
gallons. David will reduce his consumption from 333 gallons to 250, saving
only 83 gallons.
They suggested gallons per mile as a better frame, since it clearly
indicates more gas will be saved by Bill?s change from 1/12 gal/mile or 8.3
gal/100 miles, to 1/14 or 7.1 gal/100 miles, a 1.2 gal/100 mile reduction,
versus David?s change from 3.3 gal/100 mile to 2.5 gal/100 mile, a 0.8
gal/100 mile reduction. Similarly, energy per mile is a better frame for
electric vehicles (I didn?t specify ?Watt/mile?, only energy/mile). Cass
Sunstein, an economist, and Administrator of Obama?s Office of Information
and Regulatory Affairs , adopted this frame for use on 2013 car window
stickers along with the old frame. Energy per 100km is widely used in the
EU.
I agree kWh is a familiar energy unit to many, though Wh/mile gives a larger
number if you think that is important.
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