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When I was daily driving my stock 951 S I would ge 24-25 MPG. On the same route my 84 944 would get 26-27. My current daily driver BMW 530 get 27-29 mpg.
30mpg highway and about 24mpg city, but that was driving so lame and slow it was almost unbearable! Imagine not using a single psi of boost for an entire tank of gas. Hehe, I was just curious to see what it would do.