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Theoretically, the more weight you lose, the better MPG's you'll get.
But you'd have to probably lose in excess of 200lbs off the car to maybe see 1mpg increase, and that's alot to take off a Prelude and still keep it livable.
But that's why you see cars that have an engine swap with a bigger engine get better MPGs, because they have less weight to pull around and the engine doesn't see the need to use all that fuel when the load on it is so small.
Does anybody remember that guy who dropped that K20A into the Insight a couple months ago in Honda Tuning? I think he claimed he started to get 35mpg, because the Insight's body was so light without the battery (and just being small to begin with) yet he still had all that power he could use to really make it move.
There was also an article in Sport Compact Car years ago about a guy putting a Cadillac Northstar engine in a Volkswagon Golf III or something like that and he claimed he was getting 30mpg.
So only if your goal is to start shedding major poundage will you ever have to resort to getting carbon fiber (because you'll look for weight everywhere you can).
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