I think your only flaw is, as the cars become more economical mpg wise, we will still be able to hypermile them extending their posted ranges.
Therefore the saving will still remain constant over time. Just because a window sticker says it does 45mpg definately doesn't mean everyone drives it to get to that range.
We on the other hand strive to double it, thereby saving more money than what a straight formula can predict .. IMO
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Thx NoCO2; "The biggest FE mod you can make is to adjust the nut behind the wheel"
I am a precisional instrument of speed and aeromatics
If your knees bent in the opposite direction......what would a chair look like???
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