Accuracy? I'm not sure what problems there are with accuracy. I'd say it's right on the money with tire pressure and ambient temperature. It tracks transmission temp very closely with load (up when it should, down when it should). I like having the average MPG readout, but I don't get the "instant MPG". I think it's a bad idea to watch your dashboard readout for instant changes! Eyes on the road! I'm very happy with my DIC upgrade. I'd say it's money well spent. Now, those tires that cut my mileage by nearly 3 mpg? That's another story!