How accurate is g-tech
) But it'll only give you a rough idea... The trick is to be very **** when you calibrate it and to make sure you use a very level straight strech of road... 
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poor dave was the first passenger to deal with that...esp with don going "hey look a corner an i cant steer at all cause the wheels are barely touching"
I've got the Competition Pro model, and it's pretty darn close.


