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The 6spd helps alot. When I first bought my Imp new, I was getting @22-24mpg on the highway. Now I had done some decent mods I got an avg of 30 going out to Utah from Tennessee, with the wife and 2 kids, granted I put the rearend with the 3.08's back in it for the trip. I probably would've gottten even better if I had a 6spd.
Poor Vipers lol . They stuck in the mod department almost, !!! Best Bang for the bucks are the LS1s and the new 03 Cobras and 04s. When purchasing in the department areas.