Another problem that might surface is the fuel pump in the tank is cooled by the gasoline in the tank. Running the fuel down takes away the cooling effect of the gasoline. When running low fuel on hilly roads, this can lead to no cooling of the fuel pump at times. It is suggested that you never run lower than 1/8th tank for this reason and also to give you alittle bit of travel time to find a gas station. Do you believe the computers anyway?