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I'm surprised nobody pointed out the 2008 Cayennes all have direct injection. I bought an '08 Cayenne S last May. Plenty of power, and from what I can tell, much better mileage than the first gen non-DFI ones earlier. I've been shocked to get a hair over 20 MPG on the highway at 75+ MPH, while the window sticker estimates 19 on the highway. Stop and go commute mileage is usually around 16+, which isn't bad for a very heavy, high performance SUV. No reliability problems so far in the first 12K miles. I'm sold on DFI technology based on this experience
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