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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 12-04-2006, 12:48 PM   #1 (permalink)
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fuel mileage for 7.3 IDI

What is the fuel mileage typically for a f350 cc,5spd,4x4. And what would the fuel mileage difference be between a turbo and non turbo.Thanks [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 12-04-2006, 05:00 PM   #2 (permalink)
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Re: fuel mileage for 7.3 IDI

mine as a daily driver is 17-19 mt 12+/- towing 7000# +.
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Old 12-04-2006, 07:47 PM   #3 (permalink)
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Re: fuel mileage for 7.3 IDI

A lot of the mileage difference is in driving style. My F-250 NA has the pump set at the same specs as my dad's F-350 Turbo, but his gets way worse mileage because we like to drive it like we stole it! If we drive his in the same manner we drive mine, they are actually pretty close when it comes to mileage. But, that's just my experience with them.
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'93 F-250 7.3 IDI N/A, future project
'88 F-250 7.3 IDI N/A, **spare parts**
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Old 12-05-2006, 12:17 AM   #4 (permalink)
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Re: fuel mileage for 7.3 IDI

Timing, gearing, fuel system health, driving style, who knows. I would expect as low as 10-12 mpg on up to 18 from my experience with these beasts.
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Old 12-05-2006, 06:12 AM   #5 (permalink)
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Re: fuel mileage for 7.3 IDI

15-20mpg depends on highway or city, Rob
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1988 F-250 7.3 IDI 2wd non turbo c6 auto crew cab w/ 92,000 miles.
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Old 12-05-2006, 10:57 AM   #6 (permalink)
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Re: fuel mileage for 7.3 IDI

I usually get right at 15 with a mix of city/highway driving. I have a 3speed auto, so I'd assume that the 5 speed stick would improve upon that a bit given the 2 extra gears...
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Old 12-05-2006, 12:23 PM   #7 (permalink)
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Re: fuel mileage for 7.3 IDI

I get 15mpg driving to work and back. I have a 5spd and 4.10 gears I would not say I drive my truck that nice either.
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Old 12-05-2006, 07:33 PM   #8 (permalink)
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Re: fuel mileage for 7.3 IDI

I get 15 mpg driving to work and back also. I also have a 5 spd and 4.10 gears.I drive normally, I like to drive 60 to 65 mph daily. I just love driving my truck so I dont get in a hurry to get somewhere. I crank the radio sit back and enjoy the ride....
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Ford F-350 Dually Crew Cab 5-Sp 7.3 IDI Centurion Conversion. No mods, rebilt IP and replaced injectors. Used as personal driver and pulling my RV camper.

Planned upgrades are a new and better turbo and larger exhaust pipes than the 21/2s that are already under the rig/ would like a 6 spd tranny but dont know if that is a feasable or smart investment yet.

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Old 12-07-2006, 09:58 PM   #9 (permalink)
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Re: fuel mileage for 7.3 IDI

16.5 (before this week)
5 speed. 275 65 16's and 4.10's
pump left alone. Looking forward to the new Turbo!

mike
Highway and city. 65mph average highway. 1800 rpm is the sweet spot!!
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Old 12-08-2006, 07:24 AM   #10 (permalink)
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Re: fuel mileage for 7.3 IDI

I went back and looked at my records. I made a special note I was driving 62mph and got 17mpg thats the best my truck has done. The worst I have got is 9.5mpg pulling about 10,000lbs. A combo of the hills and head wind I had a max speed of about 62. I had the truck in 4th and just keep the pedal on the floor for a few hours.

I do have a single cab so my truck is a little bit lighter.
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Old 12-11-2006, 03:20 PM   #11 (permalink)
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Re: fuel mileage for 7.3 IDI

Im a newbie on here and couldnt find a newbie post site so figured id introduce myself in my first post. I have a 91 F350 crewcab dually with 4.10s and a auto tranny. Ok itroduction over now for the post.

I average 11.7-13.4 mpg drivin back and forth to work 70 mile round trip all interstate so im doin 70+. On a recent road trip i noticed that when im running between 70-85mph my milage doesnt change it stays around 11-12 mpg but if I keep it around 68mph ill get about 14-15mpg.

only towed with it once and got a respectable 9mpg.couldnt get over 60mph though was pretty much on the floor and hills would knock me down to about 45mph Best i could figure i was towing about 13000 lbs.

I have a K&N filter on it and I know if I can get more air to it itd do much better. Waitin on another air cleaner assembly to come in so I can cut the fish bowl off the lid among other things

sorry for the long post
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Old 12-12-2006, 12:41 PM   #12 (permalink)
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Re: fuel mileage for 7.3 IDI

Sounds about right. Need a turbo and a pyrometer to get more power.
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Old 12-12-2006, 09:23 PM   #13 (permalink)
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Re: fuel mileage for 7.3 IDI

best I got, was 20.1mpg on a 279 mile trip, avg speeds of around 65-70, with some in town driving. That was with the 35's on it.
Now with the 285's, the best I've been averaging around 18.5 hwy, and 16 in town. As soon as I hook up the trailer(around 7K or so) I drop to right around 10-11.
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Old 12-13-2006, 04:13 PM   #14 (permalink)
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Re: fuel mileage for 7.3 IDI

Mine averages 13 around town and short trips or towing my 4000# boat... about 15-16 on interstate if I keep my foot out of it. Not too awful bad for such a big beast! zip
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Old 12-18-2006, 09:35 AM   #15 (permalink)
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Re: fuel mileage for 7.3 IDI

When I first got my truck it has 4.10 gears and I got 21mpg with the cruise at 55mph, 16mpg at 65 and 13mpg at 75 and the truck empty. I got 17mpg at the same speed with my enclosed (20' box) motorcycle trailer.

I put a 3.55 rear end in it last year. Now I get 17-18mpg at 70mph and 15-16mpg towing at the same speed. Haven't driven it much over the last year and don't have data yet for other speeds. Truck is all stock other than the rear end, a camper shell (high-style) and gauges.

All the mileage figures are from driving I-81 though VA (quite hilly) I suspect I'd get a bit better mileage in areas that were somewhat flat.
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