2 Weeks In: A Brief Review of Dodge Challenger Mileage and Ownership The Dodge Challenger R/T Plus with a 5.7 Liter V8 engine sounds mean, looks meaner, but gets surprisingly good gas mileage for such a large powerplant. Advertisement When I bought my Dodge Challenger R/T Plus, I expected her to be a gasoline glutton. I had expected to see like 12-17mpg, and indeed, when I first purchased the car, the average was 9 mpg. I’d guess because she’d been run rough more than a few times. We’re now two weeks in for ownership of this gorgeous Billet Metallic machine and as long as I’m not pushing her, I’m seeing around 21mpg pop up on my dash. I’ll have to start writing down the fuel and mileage to try to see how I’m actually doing and see if the Electronic Vehicle Information Center (EVIC) is being optimistic about those 21mpg, or if I’m actually managing to keep this kind of mileage by just keeping her at 45-75 and getting her into 6th as expediently as possible.