Quote:
Originally Posted by arcosine
Going from 175/70R14(stock) to 185/65R15 to 165/80R15 to 205/70R15 all positive for MPG. SC1 RPM now 2200 at 70 mph. Bought used 205/70R15 tires for $5 each.
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Here you have only mildly increased the rim diameter and went to taller tires. That is the way to go but not from 15" to 17" wheels.
When I put 10% taller summer tires on I see instant 10% better mileage.