Quote:
Originally Posted by mpg_numbers_guy
The smaller the car, the more things like LRR make a difference. People say non-LRRs on the Insight can cost 10 mpg or so if replaced with a tire with high rolling resistance.
Weight is also a consideration, larger tires are heavier. Unless the larger tire is LRR I'd go with the smaller LRR size.
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Aerodynamics And suspended loads can Cost more fuel economy than RR alone depending on how much larger you go.