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Wouldn't it depend on what type of driving is done most? For speeds less than say 40 mph a larger tire hurts mpg d/t increased rr. For averaged speeds over 40 mph a larger tire should help r/t the lower engine rpm.
See you're in St. Louis and have an '02 GP. Is it the 3.8L with or without the supercharger? Perhaps 'aero' rims might be a better way to go?
VT247
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