Around 6-8 months ago or so I had a slow leak in a tire that couldn't be repaired and required replacement under my tire warranty. At that time there was maybe 45k miles on my tires. So Sam's Club replaced my bad tire w/a new Michelin HydroEdge. I have happily been driving on that since it was replaced...maybe 10k miles or so. Getting some of my highest MPG tanks ever and great handling and performance esp. since adding the BT strut support. Well, today I took the car in for my state inspection to renew my tags...passed w/o trouble but they pointed out that that tire had be mounted backward...it's a directional tire and should be mounted the other way....well crap. I had it fixed (the Sam's club is 20 miles away and it takes forever to get anything done so it was worth the $14 to just be done w/ it). Now, driving home, it seems like there is a louder tire whine than I'm used to. Is this my imagination? Why do directional tires need to face the right direction...is it a wet traction thing only? Is/was it a bigger deal than I realize? Learn me something.