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Eh, I could see 43 mpg in a one-off test. Things like the deep air dam, wheel strakes in front of the rear wheels, very tall air curtains on the front wheels, roof curvature and trailing edge shape, streamlined mirrors, body shaping around the A-pillar and doors (I think that's more than cosmetic on this truck), tailgate spoiler design, all add up. Then add in the 10-speed transmission, the increased efficiency of the diesel, (probably) optimized cooling air inlet size, etc. compared to your truck--I could see it.
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