Basically as you all know LExus IS220d has two sections with MPG, one: Average MPG and other being: Tank Average MPG. Now I know what the core difference is, where I seem to get confused which one is considered the main one? When everyone says I have 46.3MPG or 33.3MPG...which one you take the reading from?
I seem to be lost at the moment because after my last servicing few days ago (60k) tank average MPG has suddenly increased to 49.9MPG and then slowly dropped to 42MPG, but my Average MPG is always 36.7MPG. I have complained to Lexus about this saying that it needs the EGR valve cleaning, but they say they had a quick look and everything seems to be OK. Although they will contact me shortly (within few weeks) to arrange for the car's engine to be taken out and cleaned. Should this work be covered by Lexus?
Any thoughts will be appreciated!
Thanks