As someone has already answered, I'd expect around mid 20's for highway and low 20's for city. But depending upon several conditions, you can squeeze up the highway miles a bit more to high 20's.
One of most important is how much you step on gas when taking off from a stop. I' have found that's an incredible amt taken off your mpg. I drive like a grandmother, in a Corolla, very slowly, but yet, even I have found I'm still pressing pretty strongly on gas in taking off from a stop. I have managed to gain about 2-3 mpg more in city by going about as gentle as I can. But it's usually much more delicate than I want to be, and yet, I still drive very slowly and carefully.
If you're more into driving like teenagers in "Fast and Furious", then you'll get low 20's for city and highway. It's hard to be gentle when you've got a 6 cyl, because you want to USE the power it has. But then of course, the more power you use, the less your mpg is.
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