Quote:
Originally Posted by ELF
its pretty discouraging when you try really hard and your mpg goes from 12 to 14.
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It shouldn't be. Miles/gallon is a somewhat counterintuitive unit, since it's inverse to what people generally care about, which is how much fuel is used.
Suppose someone drives 10000 miles.
* Going from 12mpg to 14mpg (2mpg improvement) saves 120 gallons.
* Going from 24mpg to 28mpg (4mpg improvement) saves 60 gallons.
* Going from 36mpg to 42mpg (6mpg improvement) saves 40 gallons.
If you start with a compact at 36mpg and want to save the same 120 gallons over 10000 miles, you need to hit 63mpg.
Peakster 
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