Originally Posted by 2airishuman
one other thing to be aware of minnie's mate,
ford does regular cpu reprograming 'flashes' on these trucks...
sometimes without telling the owner and during other routine services like oil changes...
mine has been done 3-4 times in the last 18 months, and one of them significantly affected my mpg.....so heads up...
Earlier this year there was a recall on the programming of the cpu and I noticed a drop in MPG's on my daily commute then too (dropped from 19.9 to 18.7 on average). I just had my oil changed at the dealer a week before this trip so they may have "adjusted" the programming then, too. That may have affected the MPG's. However, I have noticed a slight drop, +-1 MPG over the past 3-4 weeks (down to about 17.8 or so). I was just assuming that this was due to the stations in my area switching over to the ULSD.
It would seem to me if there are fewer lubricants, there are fewer combustables and therefore more would be required to burn to produce the same results, no matter how subtle that difference might be, and over the course of a tank of fuel it would make a marginal, say 1 MPG, difference. Add to that 1 MPG an additional .75-1 MPG for the additional weight of the golf cart I was hauling and the additional drag it added to the mix and that might equal the approximately 2 MPG's loss in mileage I observed on this trip.
The golf cart may have affected the mileage that much, though. I wouldn't have thought it would have added that much drag since the windshield is folded in half and only a few inches rise above the cab of the truck and the only other part above is the golf cart roof and it is fairly thin in profile. I guess that could be it though. Maybe I just don't want to admit it so I can blame the mean old government regulations and big bad oil companies!