Guess I am not 'most people'; I have never used that highly inaccurate method! For those of us who do the math, if you really want to be accurate -- use the rolling 3-tank average. Simply average your last three fill-ups. It's easy and it virtually eliminates the variations in topping off the tank.Most people check their mileage "Tank to Tank". That's what I have done for years. What other convenient way do you have?
manual, my fault.auto or manual? I think the auto would get better mileage than the manual, my manual revs pretty high on the highway, 2400 rpm at 110 kph