cobradav
Member
my highest fill was 31.261 at 604 tank miles with 25 miles to empty. Avg speed for that 604 miles was 39.61. Actual mileage for that tank was 19.32 versus the vehicle computed 20.8 for a 7.7 % error. My closest comparison was about 2.9% under similar conditions. Seems as though my fill technique may be the leading contributor to variation as no other trend appears to explain difference. I track everything in a spreadsheet for all my vehicles ( a bit anal I know)ran it down to 10 miles estimated until empty on my tank, filled up and hit 30.01 gallons. Feels weird driving to nearly 0, knowing there is a reserve, all the while thinking Murphy will strike.
Added Fuelly to my phone to start tracking it to see if I get more gallons or less doing similar tactics of driving it down for max range before fill ups.