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fuel economy - 1999 - 7.3L Power Stroke Diesel

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Old 08-29-2007, 04:22 PM
F350farmguy F350farmguy is offline
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fuel economy - 1999 - 7.3L Power Stroke Diesel

I have just purchased a 1999, F350, 7.3L Power Stroke Diesel. I get 9.2 mpg pulling 20,000 pounds, 12 mpg pulling 6000 pounds and 15.9 mpg just driving around. I'd like to here from someone who has improved thier mileage.

I've heard that adding transmission fluid to the fuel will clean injectors and improve mpg. Any experience with this. How much/often/type/results.

Thanks
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Old 08-29-2007, 04:33 PM
dawg 21 dawg 21 is offline
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That Sounds About Right Too Me Thats Not Bad At All Considering Your Driving A Truck That Weighs 7 Or 8000 Pounds
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Old 08-29-2007, 04:48 PM
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When pulling my concrete form trailers on the hiway at 2000 rpm's i get 14.5, the weigh in at 6500 to 8000 lb's. When I am running empty I get 17.5, truck with tools and me weigh 8500 lb's. Best I have gotten is 18.64 traveling through oregon without the cruise set and going the posted speed which was mostly 55-60.
I run Diesel kleen to help with the ulsd fuel and have modest results with added milage.
You don't mention if you have a hand shaker or auto. Manuals tend to get higher fuel milage than auto's
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Old 08-29-2007, 09:50 PM
justblowin'smoke justblowin'smoke is offline
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i agree with using diesel kleen i was getting about 14 after they switched fuel before i started to use the diesel kleen now i'm probably close to were i was switch was 18 just driving. i don't pull a trailer long enough to burn a full tank to get a milage reading
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Old 08-29-2007, 09:58 PM
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Stay away from the trans fluid in the fuel deal, TOO much additives that were not meant to be burned..

Use a fuel additive that was meant to be burnt.
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Old 08-29-2007, 10:35 PM
Pony Power Pony Power is offline
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We used to use the AT in the old style diesels, about one quart per 250 gallon fill up.
I've been told more than once that mixing in AT in these modern diesels will ruin the injectors.
Stick to DK or one of the other quality additives.
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Old 08-29-2007, 11:00 PM
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would my truck have a 29 or 38 gallon tank..... Was it an option? If it is a 29 gallon then my fuel milege is pretty damn good if not then it is a little low
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Old 08-29-2007, 11:19 PM
670johndeere 670johndeere is offline
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I am averaging 14mpg, I use my truck for daily driving. My truck is a CC dually.
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Old 08-29-2007, 11:22 PM
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Originally Posted by f350rebel
would my truck have a 29 or 38 gallon tank..... Was it an option? If it is a 29 gallon then my fuel milege is pretty damn good if not then it is a little low
My manual for a 2001 shows you have a 38 gallon tank with a long box regardless of the cab size. I bet your 00 is the same. Surely you have pumped well above 30 gallons in there being a dead giveaway.
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Old 08-29-2007, 11:24 PM
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honestly i just look at the $$$$$$$ not the gallons i dont know but i think it is a 28
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Old 08-29-2007, 11:28 PM
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honestly i just look at the $$$$$$$ not the gallons i dont know but i think it is a 28
Bet it ain't. Not in a long box.
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Old 08-29-2007, 11:32 PM
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i meant to put 38 not 28 my fault...
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Old 08-30-2007, 06:40 AM
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Quote:
Originally Posted by F350farmguy
I have just purchased a 1999, F350, 7.3L Power Stroke Diesel. I get 9.2 mpg pulling 20,000 pounds, 12 mpg pulling 6000 pounds and 15.9 mpg just driving around. I'd like to here from someone who has improved thier mileage.

I've heard that adding transmission fluid to the fuel will clean injectors and improve mpg. Any experience with this. How much/often/type/results.

Thanks
I am assuming you have a dulley, 410 gears, I had one, thats about as good as I got? Remember, 410 gears are for pulling, suck it up!! Just kidding If you keep your RPMs below 2 k you will yeald your best milage, but get there slower!
Rich
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Old 08-31-2007, 10:29 AM
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Yeah your MPG actually sound pretty good I do agree with trying to keep it below 2k it seems that there is a huge differece in fuel usage between 1900 and 2100
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Old 08-31-2007, 10:52 AM
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just changing the fuel fliter i went from 15-16 mpg to 18-19 mpg on the hwy @ 70mph. i now get 14-15 mpg in city and i have 36X13.5 tires i was thinking that was darn good

Last edited by blksiryder; 08-31-2007 at 10:55 AM.
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