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A lot of trucks in California rock the side skirts/moon disks/trailer tails. I talked to quite a few truckers over the course of me working in security at a truck gate. The gains are actually quite good from reports. One fellow I remember talking to said at 55mph he gained 3mpg increase, from 9mpg to 12mpg. It may not seem like much, but when you do close to 50k miles a year, the savings are enormous!
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