i found this online
http://www.mustangworld.com/ourpics/hitech/gtech1.htm from mustangworld. they say that it can measure hp to within +/- 3hp, and that the specs they list are the "REAL WORLD" expectations, not the lab ones. they actually did a pretty good review of the unit (although i dont own one to compare), and made me wanna buy one (are they endorsed by g-tech?
). possibly the accuracy varies from car to car, since
Dark_5.0 did not have such good luck with his HP reading. either way you can check the link out, hope it helps
