My only experience is with my GTech acceleromter. Only used it once for a few runs, but IIRC it was reading 7.8 sec on average. That was, however, not long after I had got the car so I wasnt so familiar with the clutch, power band etc. I also think the GTech I have is telling me complete rubbish because it doesnt ask for the weight of the car, and when I did a BHP test it came up with about 110bhp! Its only the cheap, old unit so I doubt its accuracy tbh. It also told me my last car (110bhp) was getting to 60 in 7.5 sec on a good run, when it was stated as 8.9 by Suzuki (and Evo magazine apparently.)
Still, I might try it out again and see if anything is different. Better off with a stop watch and sat nav though I reckon!
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