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I push in the trip odometer every time I fill the tank, and it's usually around 280 miles if I've been driving around town and 310 miles or so if I've been on the highway for the entire tank. I haven't noticed a huge change in those numbers. How big would the change in mpg have to be to be significant? I haven't noticed a change, so I figure the mileage hasn't changed by more than 5%, if it has changed at all. I think it has stayed the same.
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