Originally Posted by T_Terror
Ive heard the latest version one is pretty accurate.
I cant remember if its 1tenth or a few hundredths of a second off, but ive heard theyre pretty good.
0-60mph they appear to be VERY accruate.
1/4 mile times can be anywhere from 0.05 to 0.2 seconds out (usually they are too generous) from my experiance.
I never tried to measure HP, thats what a dyno is for if you really need to know.