Is Gps speed reliable

yeah but idk he aint no gangster he is almost 40
i dont like the rims i admit....my dodge ram 2001 still has stock wheels and rims
and i had it for almost 8 years suprisingly not much wear on the tires
ima check it with my truck tomarrow cause its kinda late over here

sorry for the rant... speedo w/stock wheels should be accurate. Has to be accurate to measure millage correctly for DMV and insurance.
 
I have two GPS units, and they are within one MPH of my speedo in my cars (and one car is an ex-police Camaro with a certified speedo)
 
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