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I installed my hood vents two days ago. I wasn't able to do A-B testing because it was windy when I finished--my results would not have been accurate. These hood vents do appear to let a lot of heat out, which is good. My mileage does seem to be higher than normal. My morning drive to work is usually 22.5-23.5 mpg. Yesterday I got 23.9 and today I averaged 24.1. I can't conclusively say they've improved mileage at this point, but they definitely aren't harming anything.
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