Again in the interest of science I filled up this time at 1/4 left, it took 10.6 gallons, which is 3.6 per 1/4 for a total if 14.4. Pretty dang close if you ask me.
My filll at 1/4 was 3.7 gallons
1/2 was 8
Also today was 27.6 mpg, car indicated 27.9, so my adjustment of -3% I had the dealer perform combined with my odometer error of 2.9% is spot on