Lowering with 16"

[PetersRedYaris]

Originally Posted by Go4th

That don’t mean your odometer is wrong.
They may just have the speedometer calibrated a few mph off on the top end on purpose. Lots of times your dead on speed on the slower mph than the higher mph. They want you to think that you’re going that speed to help you.

If your speedometer is off at high speeds, it's off at low speeds too. The reason you don't notice, and think it's dead on, is because it's "less" off.
Example: 70(speedometer)MPH=67(actual)MPH - 4.28% off

This means at 30(speedo)MPH, 4.28% off is 28.71(actual)MPH

1.28 MPH is not noticable on a speedometer but is still there and hence the speedometer is still incorrect. This is why higher speeds are required to see speedometer dicrepincies.

How does it help me to think I'm going to fast?