During our three full days behind the wheel of a 2009 Audi Q7 fitted with the 3.0-liter turbo-diesel, we were easy on the throttle, coasted a lot, and worked to maximize fuel economy, not speed. The results were impressive, as we achieved almost 31 mpg during one jaunt from Mammoth Lake to Monterey, California. Furthermore, when we drove with complete disregard for efficiency, we still couldn’t push our average mileage below 26 mpg. This kind of fuel economy matches that of many smaller sedans.
Source: Automobile Mag