I've only filled my tank 3 times. Each time I waited until the low fuel light came on then filled up right then, like in a mile, do city driving. I've put 10.6, 10.4 and 10.2 gallons in it, fill it up up. Thing is warning light is supposed to come on with like 1.6 gallons left and I'm at 10.4 gallons added. So how much does it really hold, or is my warning light wrong and have at most 10 miles or so left?