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The best way to check this for accuracy is to try these speeds everyday for 2 or 3 tanks and figure it using the miles divided by gallons method then go back to your old speeds and check it the same way. The scan gauge is a good tool, but it's not always perfectly accurate. It does seem that you would have lost some FE by driving faster, but I have read of others claiming to get better mileage at 60-65 than at 55 although it's never been the case with me.
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