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Switching from P175-65R14 to P185-70R14 tires has resulted in a 2.5% increase in MPG. This is based on the average of the last 5 tanks before the tire change, and the 5 tanks following the tire change. Odometer mileage was corrected based on odometer error for the different size tires.
I haven't entered the data on my MPG sheet here, but have it in a spreadsheet.
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