awwww you burst my bubble
well I take it as it comes......
I have a unit that does that for me so I will trust its close enough for me
irregardless of what I actually get it is what it is
fwiw
when I first got my truck in 04 I did the mileage calc and IF memory serves it was somewhere around 15.5 mpg
so even if it is off by 1-2 mpg its still not to shabby