I've seen 30-31 mpg on flat freeway @ 65mph a number of times, taking it easy on the go pedal.
Remember that in general, power is related to the amount of fuel you burn. Bigger engines and turbocharging just give you the option of burning a lot fuel to make a lot of power, but you don't have to.
Not that you buy a 300hp car for this reason, but I've found if you always keep in mind power = fuel, it goes a surprisingly long way.
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