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Just realized you also asked about mileage at 80 MPH. It's fine. Back when I was on stock tires and rims I averaged 30-31 MPG with mostly highway miles and some city driving mixed in. When I went to 18x9.5 wheels with Michelin PSS tires, I dropped to 25 MPG. So your choices definitely matter. If you go to forced induction, you'll see a drop. And you won't get the best mileage if you romp on it.
But if mileage is your biggest concern, buy a Prius. Our cars provide excellent economy for what they are.
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