MPG improved with heavier tires???
Our F150 came with the stock P rated, SR-A Wranglers. I didn't think they were as bad as most people claim, but if I needed new tires, why not try to eek out some improvement? So I debated going w...
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When I updated my F150 from P rated tires to E-rated, I didn't notice any change in fuel mileage. What I did notice, though, was my speedometer was suddenly off by 2 mph at 60 mph when compared with my GPS even though the tires were the same size. It was previously right on. That told me the new tires did have a slightly different diameter. Have you checked your speedometer for accuracy? It could affect your odometer.
