I'm not suggesting that the device won't fix the problem, only that based on all the technical information I've read to date, I don't understand why there is a problem in the first place. Any GM vehichles I've read about to date (which really only includes 2K+) all talk about using the standard of 4000PPM. I might be missing something here so I'll read further.

I don't get it either but its definitely off. Is the intense re-calibrator a permanent fixture or more of a tuner? It says it can even fix stock speedometers which can be off by up to 4% so I think it would fix my problem. I just don't want a black box in my car all the time just to make the speedometer work correctly.

Yeah I can live with the speedometer being off by alittle bit. I have a aeroforce guage that displays my mph anyways. So its really not that big of deal for me. I wanted to show my actual mileage because I love looking at a 180,000 miles and knowing its still going strong.

How much is the speedometer off by though?

I would estimate it at about 10%. When I'm going 50 its 5 off.

I'm guessing in km/h it would be even more though..

Ive adjusted the needles to where its right on around 70mph. Its really not an issue for me.

Interesting idea. Where does the needle rest when the car is still?