Not a terribly accurate way to check, but at a club meet followed a predetermined course for 52 miles and filled up, worked out at 68.5 mpg. If only I hadn't redlined it passing that old blue-rinser, might have won the competition.....
Average 45 mpg, have seen 52 at steady 75 mph. Superchips actually seem to improve your mpg if you drive carefully, and Optimax gives me an extra 2-3 mpg.
Cinq sporting 1242cc