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Gtechs are quite accurate ET wise as long as you are on a level surface and have it mounted to the windshield properly. The mph though is consistently 3-5 mph faster than what you will see at the dragstrip. So the mph at 15.5 would have been closer to 91 mph at the strip. You would probably be around 15.0-15.1 just like mkivsupra said at about 96 mph.
 
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