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I can easily effect my MPG by 2 or 3 miles per gallon by how aggressively I drive on acceleration. I also notice my MPG went down in the winter with the different blend in winter gasoline by at least 2 MPG. My 1LT auto is stock and has 19" polished aluminum wheels with Pirelli all season tires at 35 PSI. I have about 50/50 city/highway driving and average anywhere from 20 to 24 in summer depending on how lead footed I am. I've gotten 29 MPG on interstate going 70 to 75 MPH for a 300 mile trip. Last winter the best mileage I got was about 21 maybe 22 MPG in my normal local driving. The more highway miles the more my mileage goes up. The more stops and starts the lower my mileage is.
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