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I usually fill up every third or second day of driving to the base. 114 miles round trip. Usually I'm filling up between 14.5 and 16 gallons and get around 320-340 a tank. This past tank, 490 miles and that was probably 90% highway at 72mph and the rest stop and go city traffic. After that last tank I filled up with 15 gallons. So that's about 32 miles per gallon average. I'm betting on a long haul (100% highway) I would be well over 550 per tank.
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