I've seen over 600 miles to empty several time on the run from Dallas TX to Spring Hill FL. Have done the 1100 mile run with 1 gas stop. If you drive thru a full tank of gas all highway at under 75 mph and not using the brakes you will see over 600 at the fill up. I've seen over 700 miles to E doing the trip in my 6 speed manual '05 Spt Pkg 330i. The Viper does much worse!!!

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!