I get about the same mileage with my Tundra under the same conditions, however when towing the Passport I get about 12mpg max, but that's with the bias ply tires that came with it, I plan to change them out with radials and expect to do better by about 1 to 2 mpg due to the lower rolling resistance of the radials over bias ply’s. The Tundra has a 6 speed double overdrive transmission and when I tow I have it in the tow/haul mode and use selective shift in the 5 position which restricts the tranny to 5 gears, I find that I get my best mileage that way.
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2005 Springdale 249BH FW
2008 Toyota Tundra Crewmax 5.7L
Tow package
Timbrens
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