Recently I have been seeing some real low MPGs around town. I am usually running short trips up and down the hill with a dump trailer, boat, or utility trailer. I'm not complaining but usually it is 9-10 mpg if I'm only around Ithaca. Also when I drive to work it is a mile away truck doesn't even warm up. Last weekend we ran the Army Ten Miler in DC. When I filled the "Billy Bus" as my ex is known I reset the lie o meter and went on our way. On the way back from DC was at less than a 1/4 tank and pulled in to a place to fuel up with a good price on diesel. Filled her up for less than 100 bucks, Wow! lie o meter says 16 MPG driving mostly 75-85 mph( try to set cruse at 79) sometimes 90. Ask my wife to hand calculate and come up with 16.2 mpg. I personally have seen better mileage when I have been driving fast like that. Any one else?

 

My SD gets 18 on the highway consecutively and 12.6 in town. (when I drive it right)
11 mpg if I drive it like i stole it.

 

I get mid teens, but I'm guessing my EBPS really needs to be cleaned. We'll see when I get it back from the body shop next week if that helps. Otherwise I'm going to be looking at injectors.

 

WTF, You guys must have something really wrong !! You should be getting in the low 30's pulling 10,000 LB's up 60% grades according to one of our newest oil burning members. LOL

 

What engine do you have?

 

I think he has the 6.0....I was hoping it was a 7.3 getting those numbers

 

This morning when I left home for work, my display said I had 48 miles to empty. I drove 25 miles and when I arrived, it said I had 8 miles to empty. What's up with that? Never trust those displays.

 

I've had mine leave me stranded, five miles from the gas station. Stupid display said I had 80 something miles to empty. On the other hand it's taken me all the way to under 10 miles to empty and I made it to the gas station just fine. I have just made it a habit now to fill up when I hit 1/4 tank and yes never ever trust that thing

 

Last I heard was the distance to empty is based on previous 500 miles... So if you had great mileage to start with then it dropped off for whatever reason, then that would be why you ran out when it said you still had miles... Either that or your in tank pickup has issues

 

The problem with those displays is that they can't account for the way you are driving. If you mash on it, mileage is poor, if you're easy on it, mileage is better. If you have been driving hwy for 3/4 of the tank it will show that you have say 50 miles to empty, but if the last 1/4 is city, or you're just mashing on it, the miles to empty will jump like yours did. Even the newer cars (I also have a 2011 and a 2012 with lie-o-meters) can't adjust smoothly enough to show a good tend without jumping.

My favorite is when I full up and it says 435 miles to empty (after city driving 15 minutes to the gas station from work), and I drive 45 miles home (all highway) and then it says 450 miles to empty.

 

Guys, always remember, the overhead estimated MPG's are based on previous miles driven, not based on what you have left in the tank.

Even if it was based on what fuel remains in the tank, the float system Ford uses in the tank is so woefully inaccurate it's ridiculous.

The best way to get the most accurate reading on the overhead is to reset it every time you start your vehicle and drive it.

Stewart

 

I never let my PSD run that low, too many bad and expensive things can happen if there is no fuel.

My lie-o-meter is showing 12 MPG, can't get by on a tank without pulling something heavy.

 

motor in the truck is a 6.0. It has many upgrades and I run a tune from Gearhead srl+. My question was more that is appears to me that I get better mileage when I drive above 80 mph (rpms over 2300-2500). The comment about the lie o meter was more a surprise about how close it was to actual.

 

Totally. Something like that happened to me the other day. When I started in the morning, it was telling me 225 miles to empty. BUT the drive to town was all down hill (we live on a mountain). So by the time we got to town it's telling me 289 miles to empty.

The problem is that the truck only knows how you have been driving. It can't know how you're going to drive in the future.

The point is that you should give the truck's estimate an appropriate amount of slack, and you better be thinking about filling when you get down to 2 digits!

 

Coming up on 7,000 miles, and I'm starting to get some good data on the difference between indicated (lie-o-meter) and actual (based on actual gas used and miles clocked).

I graphed this in a spreadsheet. This shows the actual variation in terms of percentage. There is also a line showing the linear trend.