How much mpg do you have to gain from lowering it?
That's the question! I would get some heavy duty ratchet straps, lower it to the bump stops and do some a-b-a testing to get some baseline MPG figures. You could always run shackles with multiple holes if you wanted to raise it up a few inches for part of the year. I'd expect something more like 2 up and 2" down more realistically.
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