I have a 91 Astro van 4.3 litre engine as I travelled on vacation and through the city I noticed my speedometer reading higher than the speed signs. It doesn't matter what speed I travel my speedometer is 5 kph faster than the speed zone signs read. I started looking at these speed signs since I went for my e-test and the mechanic said that my speedometer was off. Any suggestions on what could cause this.
Thanks Mike