99 F250SD 5.4/auto with 3.73 gears and 287/75r16 tires. Runs smooth, but 160-200,000 miles (debatable history) with synthetic transfer case and gear oil and a tonneau cover. Best I've gotten yet is 13.9mpg 99% highway 1% offroad. Typically I see 11.5-12.5 50% highway 50% city.

But those numbers are if I baby it. Driving it in a ...more enjoyable... manner... I see single digits.

 

Have a 2012 6.2 with 4:30 rear end, 4X4 crew cab short box. Pulling 13,000 fifth wheel get 7.5 to 9. running empty with box cover get 14 to 16+ Have 9000 miles on it at this point.

 

08 F250 2wd 3.73s 5.4, recently dropped from avg 15 mpg to 12.5 .....new tires and winter blend fuel, happens every year.

 

Anyone here have a 5.4L gas "tuner/programmer" and can actually say they picked up some real life mpg?

 

Really????

 

Gaining MPG with a tuner is a myth. And MPG increase you get should be considered lucky. Every vehicle I've owned has been tuned and I'd say a actually lost MPG, not much but I did.

 

I wouldnt say i picked up any mpg with a tuner. The only thing i noticed was shift points, it almost feels like i lost a little low end power

 

2007 5.4 SC/SB 2WD 3.73LS averaged 16.2 mpg over the last 3300 miles. Lowest was 15.2, highest was 17. Mostly highway miles, sometimes loaded with up to a ton in the bed, which doesn't seem to affect mpgs at all. What does affect mpgs is sitting in traffic or city driving.

Was getting high 16 - low 17 mpg in the 99 reg cab 5.4.

 

My truck in the sig....8-9 mpg towing(5th wheel and truck @ 18,500) back and forth to work..13mpg...cruising longer distances and not towing,...15-16mpg.

 

'99 SC 4x4, 4.10's stock size tires. I get around 11-12 mpg in town driving, 14-15 0n the hiway, all empty. Loaded or towing it goes down to 8-10.
I have picked up a little mileage and performance by using non ethanol gas which is available here locally...

 

2002 V10 SB/CC 4 INCH LIFT ON 33'S. In town I can squeeze out 200-210 per full tank. I have gotten all the way up to 330 95% highway

 

'02 excursion(think of it as a 250 with a cap) 4x4 V10 3:73

my overall average of the last 19,487 miles is 9.0mpg works out to be $0.41 cents a mile...great daily driver/commuter right? haha

but i normally see 8-10mpg city and 11-14.5 highway...been pretty consistent.

 

ouch.... i thought my 11.8 average was bad

 

it may sound bad, but for being able to haul 8 people, tow 10,000k and give a huge smile every time i drive it. i'd say she well worth it

 

2008 F250 XLT V10 6.8L Crew Cab Long Bed - 10/14