We are talking of a day in Mid may with the cruise control on. I'm quite sure I could get more if I was doing say 65 or less because of the wind resistance. Fuel used is measured pretty accurately. I wait till it clicks off and pump in about 3 more gals. That and some rocking is about all the tank will take before it spills out.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow