Originally Posted by twakefield

Well I am starting to wonder if VW did the programming for our trucks...

I am pretty particular about tracking my fill ups and I stumbled across something today when I finally put them into my excel sheet.

I have 13,591.5 miles on the truck so far and kept track of the receipts as I went. So here is the quick math for you guys.

2015 F150 Crew Lariat 3.5L EcoBoost 3.55
Total Miles: 13591.5
Computer Gallons total: 914.3
Pumped Gallons total: 946.056
Difference in Gallons: 31.756 (or in my mind my truck has consumed a full tank of gas that it doesn't know about)
Using Computer MPGs = 14.87 mpg
Using Pumped Gallons MPGs = 14.37 mpg
AKA off by around 1/2 mpg.
Truck averaged 0.42 MPG Worse than the computer showed per fill-up


2012 F150 Crew XLT 3.5L EcoBoost 3.55
Total Miles: 51127.1
Computer Gallons total: 3154.5
Pumped Gallons total: 3190.75
Difference in Gallons: 36.25 (at 13,593.7 off 8.655 gal)
Using Computer MPGs = 16.21 mpg
Using Pumped Gallons MPGs = 16.02 mpg
AKA off by around 1/4 mpg.
Truck averaged 0.08 MPG Worse than the computer showed per fill-up

So 2012 vs 2015
Avg MPG 2015 = 14.37 mpg
Avg MPG 2012 = 16.02 mpg
Computer Error 2015 [(pumped - computer)/pumped] = 3.4%
Computer Error 2012 [(pumped - computer)/pumped] = 1.1%

This sure is raising some questions in my head...