New update for the latest fill-ups:
Gallons Miles Tank's MPG (#)
10.102 424.90 42.06098 (1)
9.134 379.50 41.54806 (2)
9.284 409.80 44.14045 (3)
That's 11 straight 40+ mpg tanks in a row now.
In general, I filled up one click past the shut off, I did quite a bit of drafting, kept my speed under 65 mpg, but over 55 mpg, a lot of downhill in neutral gliding on the highway, some pulse and gliding and shut off the engine and costed up and waited at long traffic lights.
(1) and (3) were my usual commute driving with some A/C during the 95+ days. (2) was more city driving with passengers and A/C. (3) I worked in more FAS with some gliding to red stop lights and FAS gliding down a big hill off the highway.
Just adding up the total gallons and miles gives: 245.11 gallons over 9450.0 equals 38.55412 miles per gallon.
Finding the mean mpg of the fillups listed above gives 38.51939 mpg with an error on the mean of 0.6140019.
Either way it looks like the lifetime average for my Fit is 38.5+-0.6 mpg.
My CleanMPG chart keeps looking nicer all the time:
I made a fit to this plot with mpg=a*(1.0-b*exp(c*x)) where x is number of days since my first fill-up, that is x=1 is the "day number" of my first fillup. This is my simple attempt to estimate the "limiting mpg" of my Fit. That is what is the mpg as x tends towards infinity. Based on the mpg data I've recorded the fit gives a limiting mpg of 52.6+-0.4 with a chisquare of 1.1, not too shabby. The fit is good (I'll show it when I get a chance) and the value of the limiting mpg agrees well with some of the better mpg reports posted on this forum.