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I routinely go 55 in a 70, and 50-55 in a 65 on I-40. Sometimes cars come up on my quickly but not too often.
70 MPH speed limits do not have gas mileage taken into account at all. When I drive 70 vs. 55, I save about 8 to 9 MPG in my car. If the state wants me to drive 70, they'd better be prepared to reimburse me for the gas, because I'm not going to speed up.
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