Just wanting to see what people get for ther 6.9's or 7.3's. I have heard people getting up too 25 mpg(6.9L) when they baby it. Just wanted to know what people get. Thanks alot.

 

it all depends on how you drive it, if i baby my 6.9 F350 dually i get 16-18 on a worn out motor, if i baby my dads freshly rebuilt F250 6.9 i can get 20-22, if i run it like its made to pull it goes down to 10-12.

 

Just calculated 17.1 running on 470.6 miles driving around town/back and forth to work. Get much better on the hwy. '89 7.3 zf5 3.55s
Brent

 

My 7.3 5spd seems to get 16 to 17 just doing 75 on the highway and 14-15 when i'ts working a little. So far I like the numbers above a little better

 

hmm........ depending on the day heavy or light footed no load to loaded anywhere from 10-22mpg. That with a 6.9 and a zf5-speed and 4.10 gears.

 

7.3 zf5 speed 35x12.50x16.5 3.55 20-22 empty,,12-14 pulling 7700lb camper,but thats with a new IP

 

6.9 c6 3spd, driving normally, 10mpg w/no load...somethings wrong with it though, I haven't figured out what yet though

 

If I keep it about 65 on the highway, close to 20 light towing or driving normally, 16. Heavy towing, about 10.

 

1993 7.3L 4x4 supercab LB, 4:10 rear axle: about 13 around town, 15 freeway @70-75, 10.48 mpg pulling 4500# travel trailer, 16 mpg going 55mph empty.

 

I've got seven diesel trucks - all G.M. (Chevy) 6.2s except for my 85 Ford F250 with 60,000 original miles on it and a 6.9 diesel. Runs great, starts better then my Chevys, but it is absolutely awful on fuel mileage. It's the heavy F250, extra cab, 8' bed, 4WD, and three-speed automatic - 8600 lb.GVRW, 155" wheelbase,and 3.55 rear. The best I've gotten at 65 m.p.h. on the highway is 10.6 MPG - no load, no trailer! Towing a loaded trailer it's not much different. Hard to figure. I've been a diesel mechanic for 40 years and I can attest that the truck is in excellent mechanical shape. Runs great, starts great, no smoke, does not run hot - where the heck does the fuel go? My worst mileage Chevy truck gets 18 MPG (3/4 ton, 4WD, 6.2 diesel).
Has anybody ever made one of these trucks better on mileage? If I could get 14 MPG on trips I'd be happy with it considering it IS pretty heavy. As far as the owners that claim to get better than 20, I'd have to see it to believe it. My neighbor has a 3/4 ton Cummins powered Dodge that gets 17 on the highway, and a new Chevy Isuzu Duramax diesel and the best he's gotten so far is 16.5.

 

86 F250, C6 trans, 3.55 gears, 12 mpg towing, 16 mpg unloaded. My 99 PSD got 15 towing and 18 unloaded.

 

I kinda thought 25 mpg for alittle much.

 

For what it's worth, mine is a 1994 turbo diesel F350 five speed crew cab w/ 4.10 rear. It's a dually. 10.6 is bad. Fuel leak maybe?

 

92 7.3NA F250 ext cab long bed E4OD 3.55 with a ranch hand bumper replacement gets about 16mpgw/ a bad injection pump

 

1989 f250 4x4 e4od 4.10 gears 16.0 mpg combined hw/cty empty