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I would suspect something about the transmission. If its a tranny with a low overdrive, you won't be able to get over a certain amount from the engine having to spin too fast on the highway. Highway speeds could be affected by the generally boxy shape of most volvos I've seen too.
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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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