I have read numerous posts from folks regarding speedometer issues . The feedback from TW members seems to be that Toyota has an allowable amount of error ~10% and if is with in the margin of error, they will not replace the equipment. The trend that I have noticed, more often than not, is where the speed is reading higher than the vehicle is actually traveling.
What are the benefits to this and to whom?
1. With speeds higher than actually traveled miles will be clocking faster than the vehicle actually travels thus your warranty will expire sooner than it should. Benefited party – Toyota
2. If you put on plus size wheels and tires you may be able to correct some of that error. For example, if you have a two mile per hour error and go to a 17 inch wheel you should be able to correct it to zero. If you go to an 18 inch wheel you may clock miles slower than actual and thus your warranty will last potentially longer than the actual miles driven. Benefited party – Owner
So my question is do you think Toyota assumes owners will be putting on larger size wheels and tires on their Tacoma's and as a result factors this in and put's in speedometers running with this error?