Quote:
Originally Posted by roosterk0031
... IMO once you get over 30 mpg the gains aren't that big. Getting 35 mpg out of the Impala is pretty easy, I've been driving it recently.
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Yes the returns diminish proportionally. But whether the returns are worth it kinda depends on your perspective. Using your example that 40 mpg saves $321/year versus 35 mpg on your commute, I'll just say that my entire yearly auto insurance bill on my 1998 Civic is about $400.
If the OP can get to 60+ mpg (freeway) or something close with a lightly-modified & lightly hypermiled, glorious, Gen2 Prius he would save, in your commute scenario, close to $900 a year (guestimated) over a 30 mpg ride. And that's after tax money, of course. To me, that's worth it.