What's Your MPG?
Postmaster
Joined: Jul 2003
Posts: 2,976
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From: Rep. of Texas
10-14, with a ZF five speed, 35's and 3.55 diff gears (should be 4.10's at least). Varies between 10 and 14 depending on the speed. 14 is about 65, 10 is about 80 or 85 and fast acceleration. I have a front and rearend bumper replacement, wich dcreases mileage, 1 mpg less for every 1000 lbs added.
Senior User
Joined: Apr 2004
Posts: 109
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From: Jax Fla.
I get around 16-17 combined hwy/city on 35's and 4:10's unladen and around 12-13 pulling a 7000 lb fishing boat. I have a Banks turbo. I don't think I've ever taken a long hwy trip without a trailer to judge my hwy mileage.
Elder User
Joined: Oct 2002
Posts: 834
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From: Germany
I'm getting arround 14 mpg with 3.55 rear and C6 automatic. It make no diffrence between city and highway.
Jens
Jens
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Senior User
Joined: Dec 2003
Posts: 184
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85 fuel mileage
I've got a 6.9 liter 85 with 50K original miles on it. Runs beautiful, but it's an absolute dog on fuel mileage. Has 3:55 gears, C6 auto, 4WD F250 HD. Best I've ever gotten was 12 m.p.g. on the highway. My Chevy truck 4WD 3/4 ton, 3:50 gears and T400 three-speed auto. and 6.2 engine has gotten 19 m.p.g.
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New User
Joined: Mar 2004
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I'm the same as Jens. I have an '89 F350, 3.55/C6, Crew Cab, LB, Duallie. 14 is all I get - unloaded city or hwy. I pull a Variety of trailers (gooses) and the mileage ranges between 10 (30') to 13 (18') at hwy speed.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Did get 23 once when on a very slow 35-45 MPH sunday cruise.
Most of the time running around town empty 14 to 16.
70 MPH interstate run 12
Pulling or hauling stuff around 10
Plowing snow 4
7.3 turbo 4 speed and 3.55's with 33" rubber 9' dump bed and 2 30" underbed toolboxes with snow plow frame and 70 gallons of fuel. 7860 lite weight without me.
Most of the time running around town empty 14 to 16.
70 MPH interstate run 12
Pulling or hauling stuff around 10
Plowing snow 4
7.3 turbo 4 speed and 3.55's with 33" rubber 9' dump bed and 2 30" underbed toolboxes with snow plow frame and 70 gallons of fuel. 7860 lite weight without me.
Postmaster
Joined: Mar 2003
Posts: 4,038
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From: Spokane WA
Originally Posted by jdemaris
My Chevy truck 4WD 3/4 ton, 3:50 gears and T400 three-speed auto. and 6.2 engine has gotten 19 m.p.g.
Wew should probably leave the chevy talk be though huh
Point is I suppose that mechanical condition, gearing, and driver are going to seriously affect fuel mileage in a diesel, just like a gas motor
Junior User
Joined: Dec 2003
Posts: 52
Likes: 0
From: Dallas, TX
I generally see 21 on the highway, and 15-17 in town or in rush hour traffic. Thats cc, 6.9, turned up 7.3 pump, RDT, 33" tires, 4.10's and ZF5 spd at around 70 on the big road turning about 2250 on the tach.
Tuned
Joined: Nov 2002
Posts: 348
Likes: 0
From: Benson, AZ
Last time i checked i was gettin about 12 MPG with a 86 f250w/ 6.9 & 4spd and 4:10 rear. also my injector pump is not set correctly and my clutch is going out so that is negitively affecting my mileage.
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