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With a light foot, 955 Cayenne TT can get 15-17mpg on the freeway during extended cruising. Mix any city in that and the mileage quickly plummets. My 10mpg figure is mostly city and spirited driving. The direct injected 957s were a couple mpg better, and the lighter 958s a few more. So a 958 TT might see 20ish on the highway with a light foot. Non-turbo and V6s were better.
The diesels are easily 10 - 15mpg better - - mid 20s to 30ish. I don't know them as well, but they have a strong following. They were subject to Dieselgate and have an extended engine warranty which is a plus. But they also have some carbon deposit issues which are an extra maintenance item.
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