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  #1  
Old 06-19-2010, 04:26 AM
Big Red F350
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12 MPG???? with a 1996 7.3

I have a 96 f350 crew cab long bed. Built e4od. 3.5" straight thru exhaust. Tymar intake. Tony Wildman tunes. 4.10 rear end. New 315/75/16 AT tires. I dont drive it very hard and I average 12 MPG and thats mostly highway. I cruise at 2200 rpm. When I pull my 6500 lbs trailer I get 8 MPG. Any ideas on what to check? It seems llike most guys are getting 15 -16. I would love that. Thanks
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  #2  
Old 06-19-2010, 04:33 AM
countryboyrob
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Re: 12 MPG???? with a 1996 7.3

up-pipes leaking? when was your last oil change? what psi are the tires at? any brakes dragging?
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Old 06-19-2010, 04:40 AM
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Re: 12 MPG???? with a 1996 7.3

swap to 3.55 gears
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Old 06-19-2010, 04:48 AM
Big Red F350
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Re: 12 MPG???? with a 1996 7.3

oil changed about 8 months ago and used a motorcraft filter. I dont think the up pipes are leaking. Tires are aired to 44psi. Also forgot to mention i have a 3" downpipe. I havent checked the brakes.
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Old 06-19-2010, 04:53 AM
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Re: 12 MPG???? with a 1996 7.3

Have you changed out the injectors?
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  #6  
Old 06-19-2010, 05:26 AM
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Re: 12 MPG???? with a 1996 7.3

too many rpms,get bigger tires or higher gears,or go slower.keep it under 2000 rpms for best fuel mileage.
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  #7  
Old 06-19-2010, 06:25 PM
Big Red F350
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Re: 12 MPG???? with a 1996 7.3

It has stock injectors with 140k. Does everyone else just drive their trucks between 55 mph and 60 mph?
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  #8  
Old 06-19-2010, 08:06 PM
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Re: 12 MPG???? with a 1996 7.3

Nope. I drive 60 and 70 MPH.

You have a low-MPG configuration.

The automatic is killing you. The 4x4 costs you 2-3 MPG. The CC is heavy.

The big wheels are kickin' your butt.

You didn't mention a tonneau, so I assume your are running open bed.

Wildman tunes may improve your acceleration, but in that draggy configuration that just means a faster fuel burn rate.

If you can't change the configuration, your choice is stark: Slow down or eat the poor fuel economy.
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Last edited by Dave Whitmer; 07-06-2010 at 11:53 PM.
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  #9  
Old 06-19-2010, 11:12 PM
countryboyrob
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Re: 12 MPG???? with a 1996 7.3

Quote:
Originally Posted by Big Red F350 View Post
oil changed about 8 months ago and used a motorcraft filter. I dont think the up pipes are leaking. Tires are aired to 44psi. Also forgot to mention i have a 3" downpipe. I havent checked the brakes.
8 months ago = how many miles? also is your firewall covered in soot?

44psi is a little low, I would sir them up to atleast 50psi
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  #10  
Old 06-20-2010, 12:11 AM
Big Red F350
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Re: 12 MPG???? with a 1996 7.3

No soot on the firewall. I have only put on 800 miles since the oil change. The truck usually only gets about 1200 miles a year on it.
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