I was very surprised at the difference, but here you can do a little if you drive without music. Gasoline mileage is 1.5-2mpg better so far. There was a low rumble from the tube touching the case. I placed the remaining rubber tubing on the case. Problem solved. Is it worth the money? Only if you want your truck to do more. My truck is a 2001 Ford F150 Super Crew 4x4 with canopy, 192,000 miles and 100% original except for the big tires and rims. Everything is well maintained.
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