According to fueleconomy.gov the 2010 Audi S4 with its 3 liter 333 horsepower supercharged V6 will have EPA fuel economy ratings of 18 city and 28 highway with the 7 speed S-Tronic gearbox. The S4 with the 6 speed manual gearbox has fuel economy of 18 city and 27 mpg on the highway. The 3.0T S4 not only greatly improves upon the previous V8 powered S4's fuel economy, but it also bests rear wheel drive competitors.. BMW's twin turbo 335 is rated @ 17/26, Infiniti's G37 is rated @ 18/26 with the automatic and 17/25 with the manual. The Lexus IS350 is rated @ 18 city and 25 highway.
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