My normal average is 26mpg city/highway. On a recent 525 mile trip to Cleveland and back cruising at about 75mph, I was approaching 28mpg but Brian is right above 70mph the mileage suffers. Car has 192,000 miles and only smokes a bit at start-up from cold and when I really boot the throttle.

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown