Did an experiment with my 35d last week, it was my first long road trip, Philly to Pittsburgh to Erie and back to Philly. When I got to Erie, I had about 240 miles on the tank (reading half tank) and the computer was showing 23.1 mpg. I decided I'd do the speed limit all the way back to Philly to see what I'd get. Drove down to 80, across to 476 down to Philly. The results were pretty impressive considering where I started, 593 miles on the tank (considering at 240 miles it was showing half full), 21.536 gallons to fill, which gave me a calculated mpg of 27.54.

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16 X5 50i


prior:
12 X5 35d
06 X5 3.0
06 Z4 3.0