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Depends on your terrain you drive on too. If you're constantly driving up hills and having to use the gas pedal harder to maintain speed, that will drop it.
That still seems awfully low because I have tanks of gas where I just say screw it, and floor it and shift at 3500-4k rpm and I still maintain 25.5-26 mpg for that tank. Could be the quality of gas you have as well. There's a lot of factors that go into getting good MPG.
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