blackjackel -
Quote:
Originally Posted by blackjackel
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Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
195/65-15 5.0in 12.5in 25.0in 78.5in 807 0.0%
185/70-14 5.1in 12.1in 24.2in 76.0in 834 -3.1%
The new tire would be .4 inches or 10 millimeteres narrower, or approx 1.5 inches if you count all tires combined.
I'm going from a GoodYear integrity to BridgeStone B381
This is going from a rolling resistence of 0.00955 to a RR of 0.00615 or a difference of 0.00340 in rolling resistence!
I expect at least 5 more MPG, if not more.
Any thoughts?
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Subtracting 3.1% implies losing MPG to me. I wouldn't go with a tire size below spec on the drive wheels. But who knows? It could make a good experiment. Do you EOC? It won't matter when the engine is off.
If you can, try to do a before/after GPS correction. I did the after, but I wish I had done the before. I know I am getting a 2% gain right now, but I don't know if I was already +X% to begin with.
CarloSW2