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I have an '03 SIlverado with the 4.3 and Auto transmission and I get 21.5 - 22 MPG on the highway. I don't drive slow, but my truck seems like I have to push it a lot harder to go 70-72 than I do to go 65 MPH.
Mine is stock, I'm thinking about a K&N, exhaust or tonneau cover to help boost the mileage some.
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