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This question has far too many variables to illicit a useful answer. It depends on the car, the type of driving, the environmental conditions, etc.
If I wanted to take eternity to travel the 70 miles I often take to visit my parents and grandparents, I'm sure I could achieve 50mpg. As it is, the best I've ever done for a full tank is about 33mpg.
My signature boasts my % over EPA, and this is achieved with a lower octane fuel than recommended and no mods. This winter I plan to try a grill block, but would like to wire in an LED that indicates when the cooling fans engage.
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