Hi! this is my first post!
I found an article about how tire type can affect gas mileage (Honda Civic VX '95)
Quote:
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...For the first 45,000 miles on the original set of tires (which were lousy handing, but very low rolling resistant Dunlops), I regularly averaged 55 - 57 mpg (and this is a CA emissions car). In the winter, the mileage dropped about 10 - 15%. When I replaced the original tires at 45k miles, the same tires weren't available. The originals were lousy (handling-wise) Dunlop SP4N* or something like that. I bought a set of different Dunlops to replace them and found the mileage dropped to 45 mpg under the identical driving conditions. Luckily, I bought the tires at a place that had a "1000 mile or 30 day satisfaction" guarantee so I was able to return the first set and try another set of tires without paying for the original set. I am a conservation freak, so a 9-12 mpg (up to 20%) drop in fuel economy was not acceptable...
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Link to the original article