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yep thats about right its the same for me thats why our hgwy gas mileage sucks. put some 70 series tires and you'll get 35mpg or something like that. the taller the tire the more it cuts down the gear ratio. on 215 60r 15's i do the same as you at 65 mph it sucks. or put a j30 diff in it i think its like 3.90 or something like that. stock 240sx gear is 4.08.
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