RV Fuel Issues & Prices - Post 'Em Here!

What I think is useful about the scan gauge is the relative MPH. It quickly points out what your actions in the drivers seat do to your mpg. You can get this info instantly. When driving on a flat expressway, I would change my driving style and it would tell me what affect it was having on my mileage. I bought it because I had a code and it was cheaper than a trip to the shop. I cleared it before my trip and then had another one on the causeway coming back from Tybee Island, GA on a Sunday morning. I pulled over and used the ScanguageII to get the code number. I have the code website in my favorites on my Smart phone. I brought it up and found the code (P0326 as I remember; maybe be off a little). This is an antiknock code and I have been told by my mechanic to ignore it. The whole thing took less than 5 minutes, but boy was I glad to have it. One problem I did see was that I tended to fool with the various gauges that can be displayed and look at the road less. This can be verified by my wife's yelling at me.