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Awesome post JSH, thanks for taking the time to articulate it so well.
This further underlies my point about the absurdity of targeting particular MPGs though. If the goal is reduced CO2, this is a roundabout way to do so. The goal isn't to burn less fuel per mile precisely, but to reduce overall fuel consumption. An aspect of this is to burn less per mile, but also traveling less miles, or chosing alternative transportation methods are other possible solutions (among many).
MPGs as a measure of efficiency is absurd in the first place, because it doesn't intuitively represent the relative fuel savings. Going from 10 MPG to 20 saves way more fuel than going from 20 MPG to 30 even though both represent an improvement of 10 MPG.
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