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I have stock night edition 275/55R20 OWL All–Season Tires and 33 gallon tank. Had the same problem in the winter, during a 400 mile trip from Chicago to Mercer Wi in february barely got 23 mpg. It has improved a lot in the summer
As you can see on my picture the trip took 9hr 10 min 568 miles, that makes it 62.5 MPH. I made two stops and also hit some heavy traffic at the end. 90% of distance I was going between 68-74 Mph
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