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The cap wasnt the issue, I saw the MPG increase after I added the tool box. The old #s from the cap I threw out. It added when I had a "bumper pull" trailer. It kicked up a bit in the rear and moved the air over the trailer nicely.
This week I performed very scientific leaf testing. Very environmental as well, the leaves were recycled ! ha ha ha.
They show the tool box has definitely moved the bubble back and created a dead space behind the window. Its like the bed is now 6' long.
Side note, I'd love to move this to the Aero forum, can anybody tell me how?????
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