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  #1  
Old 12-04-2013, 04:43 PM
lindboep lindboep is offline
 
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1999 7.3 powerstroke bad mpg

I have a 99 f350 with a 7.3. Driving on thr interstate at 71mph 2250rpm I get 8 mpg.....is that normal? I have 4x4 truck has 110k on it
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  #2  
Old 12-04-2013, 04:58 PM
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that was normal for my '74 F250 with a C6 and the 460, lol.
Maybe you could give us a little more info, how long have had this truck? Has the fuel mileage always been like that? Auto trans? Oversize tires? Gearing? What happens when you cruise at say 60 mph? And are you empty/no load?
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Old 12-04-2013, 05:11 PM
lindboep lindboep is offline
 
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Originally Posted by clutch View Post
that was normal for my '74 F250 with a C6 and the 460, lol.
Maybe you could give us a little more info, how long have had this truck? Has the fuel mileage always been like that? Auto trans? Oversize tires? Gearing? What happens when you cruise at say 60 mph? And are you empty/no load?
Had it about a month always been like this. Auto tranny w/ overdrive. Normal tired and yes empty no load. It is a dually
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Old 12-04-2013, 05:20 PM
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hmm, yeah, I don't know, my '93 IDI single rear wheel, 4x4 w/5sp gets around 15 mpg. How are you calculating? I always reset the trip odometer when I fuel up, and then on the next fuel, up divide miles by gallons.
Only a guess but maybe brake drag somewhere...
Prolly be somemore folks logging on tonight that could help...
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Old 12-04-2013, 06:05 PM
lindboep lindboep is offline
 
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Originally Posted by clutch View Post
hmm, yeah, I don't know, my '93 IDI single rear wheel, 4x4 w/5sp gets around 15 mpg. How are you calculating? I always reset the trip odometer when I fuel up, and then on the next fuel, up divide miles by gallons.
Only a guess but maybe brake drag somewhere...
Prolly be somemore folks logging on tonight that could help...
Welcome to FTF.
Divifing miles by gallons. If I go 60 I get 12mpg
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Old 12-04-2013, 06:05 PM
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blacksnapon blacksnapon is offline
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Any smoke from the exhaust? Do you gain oil in the pan? Any misfires?
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Old 12-04-2013, 06:19 PM
lindboep lindboep is offline
 
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Any smoke from the exhaust? Do you gain oil in the pan? Any misfires?
No smoke from exhaust. No misfires. What do you mean do I gain oil? At idle I do notice it makes a weird noise. Almost like it struggling for air but then back and it does it like every 15 seconds

Last edited by lindboep; 12-04-2013 at 06:41 PM.
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Old 12-04-2013, 06:56 PM
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pulled the air filter yet?
couple used ones I looked at had mouse nests in the air box.
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Old 12-05-2013, 07:17 AM
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Quote:
Originally Posted by lindboep View Post
No smoke from exhaust. No misfires. What do you mean do I gain oil? At idle I do notice it makes a weird noise. Almost like it struggling for air but then back and it does it like every 15 seconds
Smoke from the exhaust.....injector slobbering raw fuel. Misfires.....injector, or bad cylinder. Gaining oil.....internal fuel leak going into the pan increasing oil level. That leaves air intake obstruction, low gears, and a few other off the wall issues.
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  #10  
Old 12-05-2013, 10:24 AM
lindboep lindboep is offline
 
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Originally Posted by clutch View Post
pulled the air filter yet?
couple used ones I looked at had mouse nests in the air box.
Air filters clean. Also ivr noticed it seems sluggish compared to other diesels ive driven. Doesn't have very much power and has a hard time getting over 65 when towning my small fishing boat
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