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Old 06-30-2019, 07:20 AM   #2
atreis
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Join Date: Jul 2014
Posts: 128
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If your cab is VERY close to the front of the trailer, you might see some improvement (think: semis). Given that yours likely has a several foot gap, you're not going to see much improvement at all. Also, at the rear of the trailer you still have a flat wall. At speed, that creates a vacuum, which nature abhors. It can fill the vacuum by pulling the trailer back, and air forward, and tries both. That's also why semis have those odd angled panels mounted on the back of the trailer.

The best way to get better mileage: Slow down.
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