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I don't often check MPGs but based on the times I have...25.9 for the Aveo on the highway seems pathetic.
My wife's Uplander got 23 MPG on a 500 mile trip we took and I was doing 80-90 most of the way.
I put a cold air kit on and reprogrammed my 03 Z71 recently and for the hell of it I checked my mileage..ended up being 17 MPG with stop and go driving and plenty of foot to floor traffic light starts.
I guess what I'm saying is something seems wrong. Are you sure they didn't dump 5,000 lbs of weights in the trunk when you weren't looking?
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