Just bought a new 2011 triglide and found that when the gas gage reads empty there is still approx. two gal. in the tank. dealer said that at empty on the gage you are supposed to go to the miles left in the tank readout. when it gets to one gal. in the tank a low light comes on and you have one gal. left. they say this is normal . can anyone tell me if this is a fact?