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Welcome to EM. Good to see ya over here.
WAI's effect different engines in different ways. You'd have to do some testing to see weather the Aveo likes it or not.
I would definitely air up your tires to max sidewall. I'd also look into doing an upper grill block with whatever materials you can get your hands on.
Other than that, driving technique has a much larger effect on mileage than almost any mod, so its always an area to look at.
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