RV Fuel Issues & Prices - Post 'Em Here!

A scan gauge ii (I have one) reads information from your vehicles computer and displays it. You can pick four measurements. Current MPG is one of the measurements. The only problem is that it is not terribly accurate and needs to be "adjusted". There is a procedure where you reset the fuel used, then drive until you need to refuel. You record how much fuel was actually used and the scan gauge calculates a percentage adjustment that it applies from then on. Mine is 14% (my actual MPG is 14% less that reported). It works well after that.