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Our 03 Sport V8 would get 23 mpg with no mods if we kept the speed under 60 mph. I had big Michelin touring tires and had them at 10% below max. That was it. My old Tundra only got 16 mpg. I don't know if the final drive is different on the 4L six but I'd say pumping the tires up at moderate speeds should get you close.
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