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jeebus · 10-03-2013, 04:18 PM

Definitely do a GPS Speedo test. My car read "slightly" optimistic when stock. Most cars read optimistic because it's better to think you're going too fast than the opposite. With my 245/40/17 tires my car speedo and GPS are exactly even.

10-03-2013, 04:18 PM	#19
jeebus Senior Member Join Date: Jul 2012 Drives: 2015 Mustang GT (on order) Location: San Diego Posts: 904 Thanks: 114 Thanked 471 Times in 208 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Definitely do a GPS Speedo test. My car read "slightly" optimistic when stock. Most cars read optimistic because it's better to think you're going too fast than the opposite. With my 245/40/17 tires my car speedo and GPS are exactly even. __________________