I drive 100MPH to work everyday too. No Joke. I hit the speed limiter at least once a day.
But I do it on I-35W from Denton to Ft. Worth and back again,
If you see the Moonlight Blue '97 'Tour driving Southbound around 7am, Northbound around 6pm, that's me. Unless your a cop, then that's most definently not me.
I still get over 400 miles to the tank. It's when I drive 20-40 that I get 250 to the tank.
Just to note, I do drive very fast, but I keep 5+ car lengths between me and other cars, always signal, practice lane discipline, and don't get frustrated when I get behind someone actually obeying the law.