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Does your impala have to have high octane fuel? I find it difficult to believe you couldn't use 87 octane on a properly tuned engine. Lower octane should give better economy assuming you don't have octane knock.
A 350 in a car that could run great with a 3.8 boggles the imagination. The setup described screams out muscle car with no chance of economy. I'd be blaming the gears in the transmission for being geared for burnouts and low 0-60 times instead of high mpg and low emmisions.
Depending on your amount of creativity, you may be able to get a manual from a Corvette in that rig. The new Corvettes have a 6 speed and can fetch 30 mpg on the highway.....of course the variable valve timing and direct gas injection probably helps out a bit. That and the Corvette is a bit more streamlined....
I agree, diesel engines mated with a manual kick rear all over the place as far as mpg. Plus, if you have some leftover grease from your fry daddy, it's free fuel after a straining. Or used motor oil. Or old auto tranny oil......
Hold on a sec, your avatar shows your truck having a fuel saving bed cover. So your Cd is likely significantly lower than stock!!
PS sorry for the double post, thought my original post was lost in cyberspace!
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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