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For as much as i know ussually the smaller width tire the better FE, one reason why companies throw small width tires on bigger vehicles to help with the mileage.
Ex. my brothers 01 grand cherokees tires are about the same width as my grand ams. Although the cherokees are trail tested it isn't doing much with small tires on it, but save gas
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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