Ah, man that stinks. And with your axle, I reckon 3.08 is as low as they go.
Hey, you never know - Bill Gates might just read this and give you a call?
Still, over 26mpg on an F-350 is huge - the EPA guesstimate for the F-150 is only 19mpg highway, I'd reckon the 350 with its heavier everything would probably rate way lower. So you're still ahead of the game.
Look at it this way: I'm struggling to get the same kind of mileage from my Subie Forester. Half the size, half the power, same mileage.
Add a bellypan and see what that gets you? Or fender skirts?
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Lead or follow. Either is fine.
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