I HAVE 37IN TIRES, 456/GEARS, SUPER CHARGER, HEADERS, CORSA SPORT EXHAUST, AND SPECIAL CAM
PACKAGE. I JUST GOT BACK FROM TRIP TO NEVADA MOSTLY ALL HIGHWAY DRIVING, HAD 4/ADULTS AND 1/DOG, AVERAGE SPEED 80/MPH AND 600/MILES LATER I AVERAGED 10.00/MPG. WHEN DRIVING IN THE CITY I AVERAGE 9.2MPG. DEFINATELY SOUNDS LIKE YOUR MILEAGE IS VERY POOR.
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