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Old 04-27-2008, 09:33 PM   #4 (permalink)
LostCause's Avatar
Join Date: Feb 2008
Location: California
Posts: 504

Thunderbird - '96 Ford Thunderbird
90 day: 27.75 mpg (US)
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I would stay with your stock gearing and drive at 55mph. You are already essentially maximized gearing-wise, since you are pulling the lowest rpm without lugging your engine. Changing your gearing will probably be detrimental, if anything.

Piston speed is still relevant as it is a function of the flame front speed. Charles Taylor was probably talking about the piston speed that maximized mean effective pressure (mep).

I would look at doing some aeromods, especially with 33" tires. Hopefully zjrog will post, as he's been seeing excellent fuel economy for a jeep. Likewise, I would take a look at his thread, located a couple down from this one.

- LostCause
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