1-Grayt-truck

Hi all, Just wondering whether or not other F150 owners are relying on their 09' AVG. MPG displays, or are simply performing their own calculations to obtain true MPG results. Seems I keep having discrepencies between the truck display and my own calculations. Usually between 1 - 1.5 mpg with the truck display always giving the higher amount. In your own opinion which method do you find is most accurate and is the method you rely upon? Thanks.

*Note: I do reset my truck's Avg. MPG display each time I fill up.

tcarro2001

I recalculate at each fillup. Mine is always 1-1.5 mpg higher than my manual calculations. Right around 15MPG on average (manual) and 16.4MPG (onboard), mostly highway miles.

canoetrpr

Mine is about 0.8 MPG higher on the display than hand calculated.

Wes28376

Yep, that's about what mine is at. I've noticed if I run about three tanks of fuel without re-setting it is more accurate.

v_tach

Mine seems to always be within 1 mpg of my manual calculations.

silverfx4

My trip computer is normally around 15.2 to 15.4 with mixed driving. Drove it from Houston to San Antonio and back last weekend. The trip computer said 15.6 when I returned home. My calculations show that I got 16.5 on the trip.
Mostly flat driving with the cruse set on 73. Only have 1900 miles on my truck so guess it may take some time for everything to get set and broken in.

farmercr

There can be a problem with doing it manually also. Are you sure you are getting a gallon of gas everytime it says on the pump. There was an article that came out in the paper about a year ago ( Fort Worth ) They did a survey on stores around the metroplex that weren't calculated. They found that alot of the pumps were way off.

09screw

I just go with the Computer. A lot less math! ; )

djquik1

I find that to be correct.....The only time I have gotten the computer to match my hand calculations,is getting fuel before 6 am when the heat has not played havoc with expansion of the in ground tank and the tank on the truck.

I got 18.6 MPG's doing 75mph avg on the way back from Indiana this past weekend.

silverfx4

I have to agree with you about not always getting a gallon. I fulled up my wife's Honda pilot with a 19 gallon tank at Wal-mart a few months ago. It wasn't on empty and the pump said I had put 20.5 gallons in a 19 gallon tank. It normally never takes over 18.5 even when the gas gauge reads empty.