Oops! Thak you RedDevil for pointing out my blunder
I was in to much of a hurry and didn't compute the numbers correctly.
Thanks for the tip Puddleglum. I have used l/100km before to track mpgs, I simply can't get used to it. What I do is track mpgs there, and reset it before leaving work. Getting the SG to accurately reflect mpgs has been difficult for no other reason than my own laziness