I notice you have left the upper right portion blank, on the MPG model, where the injector ms time is displayed on the KM/L model. Any chance you are going to put the gallons per hour there? It would be handy for us folks who are not hypermiling competitors so we could see how many GPH we burn at idle, at idle with the A/C and other testing. The injector ms is handy but is dependent on rpm for comparing gas usage since, as I understand it, it displays injector ms open per revolution.
If you only have three characters to work with and no floating point options you could put hundreths per hour as in 100 would be 1 gallon an hour and 20, .2 gallons per hour