I can usually get 100 miles from full to the 3/4 mark, 200 miles to the 1/2 mark and 300 miles to the 1/4 mark.
The best I've ever recorded was a trip to Prince Edward Island, Canada --36.5 mpg which with 14.5 gallons on board would have given a range of 529 miles.
Normal for my driving is only 25-28.

- Jim Our yardbirds: Belvedere, our '96 Jeep Cherokee, 4.0L ATX, 85,000 and going strong Spencer, our '03 Chrysler PT Crusier, 2.4L ATX, 28,000 and just getting started