acdii Report post Posted November 14, 2013 As I was driving with the fuel gauge in the red, DTE 0 for 10 miles, and the trip showing used 10.3 gallons, it dawned on me, wait, if this is a 13 gallon tank, and 10 gallons is empty, maybe the fuel gauge isn't what we are used to. Being that nearly everything in this car is based on computer programming, it is entirely possible that so is the fuel gauge. It could be that with each and every fill, the gauge is trained for the amount of fuel used when reset, so if you use 10 gallons every tank, which is about where mine is, that is where the empty mark will be. If you drive until it is really empty and pump in 12.5 gallons over several tanks, it could very well reset the fuel gauge empty point by 2 more gallons. We already know that MPG and fuel used are all averaged out over time, so maybe, just maybe, so is the fuel gauge. It may be using the mechanical float as reference only. If it wasn't winter time, I would carry a 2 gallon can full and experiment with it to test that theory, but not when its cold, I dont want to be fiddlin with that pour spout in the cold. Quote Share this post Link to post Share on other sites