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Old 09-14-2018, 03:59 PM   #8 (permalink)
Ecky
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Join Date: Dec 2011
Location: New Zealand
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ND Miata - '15 Mazda MX-5 Special Package
90 day: 39.72 mpg (US)

Oxygen Blue - '00 Honda Insight
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It isn't the width or aspect ratio, it's the tread compound and pattern. Two different 165/65r14 tires can deliver more than 15mpg difference at the same tire pressure in my car. In some cases the difference can be as large as 40mpg. Make sure you have tires which have a low rolling resistance compound and tread pattern.
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