I'm very interested in the responses you get for this. My speedometer is all f-ed up. I have 17's, which started the problem. Now, the speedometer reads 12% too fast. If it says I'm doing 70, I'm really only going 62. I even paid to have it calibrated, but the dude said there was no way to correct it to read right since the car is so new. I'm with you though, Toyota has to know how to correct it, but I don't want to pay a dealer to do it.