fuel economy
One item overlooked in computing gas milage is that not all speedometers are accurate. If your speedometer is 5MPH fast at 60mph your miles to gallon is not 10, but9.1 mpg. I have owned 4 motorhomes ...
Forum Discussion
Where does the scan gauge get it's info, it probably comes from the computer, which gets its info from the vehicle speed sensor, which is the same place the speedometer gets its info, unless it has old school speedo cable, than the VSS is mounted on the cable assembly. What I'm trying to say is the scan gauge reading should be the same as your speedometer, because the info comes from the same place.
