www.fueleconomy.gov thinks it is much lower than 49. Rated it at 23 city and 33 hwy. Still, based on the rating, I can't justify the switch since I am rated at 23 city and 32 hwy. Not worth it for that low a gain

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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