would I by any chance have anything to do with that?


As far as accuracy, it's all about setup.

0-60 times are pretty damn accurate in the newest G-tech. HP calculations are only accurate if you get your weight right on. My gtech and my ecu datalogs (taken at 16 samples a second) match almost dead nuts when it comes to 0-60.

My friend Jason had his car weighed and dyno'd. The GTech was within 5 hp with the proper weight entered. But small changes in weight or excessively jerky driving manuevers can throw it off a lot.