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It turns out to be 768 revs per minute for the 235/55 R17 Perelli P Zero Nero tires I have. Put it in my box and now speedo is right on! Thanks guys!

Hi all, I live in Flour Mound Texas. I have always loved mustangs. I was married for 19 years to a woman that said "NO"!! Well, divorced a couple years ago and finally got my toy! 09 S197 45th anniv. 4.6. I absolutely love it!! (a close second to my kids). Thing that is so fun is all the bolt...

Excellent! Thats as cool as the 9 times the square root of your tire pressure equals hydroplane speed! I will figure that thanks!

I think my speedo reads too fast. I have an SCT tuner but not sure about the revs per mile settings or the spark settings in the strategy tune I'm running. I have 17 inch wheels. Can anybody help with the propper settings to correct speedo error? Also, explain the spark settings? Thanks!!