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speedometer is off, effect on fuel econ?
I don't know why this didn't occur to me sooner, but my speedometer is off by a pretty significant amount (reads about 5 mph fast at 65 mph). I have a sheet of paper somewhere from when I had it calibrated with a radar gun years ago, I'll dig that up and post the actual numbers...
But what would be the effect of my speedometer inaccuracy on fuel econ? Could I make up for it by moving up to a slightly larger tire? currently running 185/65 R14
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