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Sometimes I like to run on the interstate in 4th gear and a while back I noticed mine creeping up to the 0. Recently I took of the front bumper cover and cleaned between my condensers and radiators, and got a ton of junk out of there, cigarette butts, and mostly a lot of leaves and straw. Since then it has been staying right on the 8. We are getting back to hot weather so it may go back up from time to time, but I do not recall a single instance of going to the 0 since I did this cleaning.
The thump, I don't have any definitive feedback on that. Maybe a wheel weight coming loose, or maybe you spun a rock up when you were crossing back into the main driving line of the highway?
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