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The cooper s and srt-4 are premium gas also, and I can tell you from reading srt forums that they are pretty much all getting well under the advertised mpg.
As for the WRX, it is also premium gas, and having owned one before I can tell you the gas mileage is not horrible, but as with the SRT-4, the temptation to drive it hard on a regular basis will hurt the mileage a lot.
I like the TC because you can use regular gas in stock form and do not have to worry about going to premium unless you decide to go with the supercharger. Not to mention if you get the blower and drive it same way you did before, you shouldn't notice any change in mileage, so the extra 20 cents a gallon for premium won't hurt too much.
I have a feeling that the numbers toyota is putting out are lower than what the numbers the EPA will get, which makes me think the numbers are somewhat reliable. I was watching MotorWeek this last weekend and they were talking about a long term test car that was getting less than the EPA mpg and noted that in the real world no one drives at the "slow speed" the EPA uses to get their numbers. My guess is that the manufactuer would want to be conservative in their estimates before the EPA does its test so as not to be embarrased if their numbers where too high. Anyway, that's my guess.