I started using an app on my Android phone called Fuel Log from the first fill up. It tracks all kinds of stats including lifetime milage, costs, etc. It takes less than a minute to enter the info at each fill up. I'm sure there is something similar for iPhone. It has nifty graphs and charts as well as stats.So in a highly technological vehicle, it does not compute vehicle lifetime fuel mileage automatically- we have do that manually. I should have used the additional trip meter for lifetime mileage. Too late now.