I took my truck for the maden towing voyage with about a 8000 lb in tow and got dissapointing results with the fuel mileage. This is on the '95 and towing relatively flat (wisconsin) I got a little above 10mpg. Everything on the truck worked flawlessley other then the fuel level sender which seams to be less than accurate. But after it showed I was empty after just 200 miles I filled up and put in around 20 gallons. I have a #10 forward, star wheel forward, afc with the light spring, pretty much everything I can do to get fuel in there so I understand a small problem but this is a little rediculous.

Where is the first place I should start looking at adjusting things. It wasn't smokey if I didn't want it to be and pulled better than I expected. I love this truck but would like to get into the upper teens like others commonly do.

 

Try bringing your star wheel back some. The full forward is for take better take off and back is for top end. Also check your timing.

 

You did not mention what you were towing, but you will not get in the upper teens towing 8000 if it is anything other than a flatbed. Tall loads (camper, enc. trailer, etc.) kill mileage because of the wind resistance.

One thing that really helped my 12v was bumping the timing up to 16 degrees.

 

What was your millage without towing ?
Whats your gear ratio ?
Mine is 20 mpg mised driving .
15-16 mpg towing about 6000 mixed driving .
Gear ratio 3:55 .

 

Gear ratio 4.10 I know this isn't helping much
Towing a lifted heavy brick also know as a Jeep Cherokee
Timing is set at 15.5-16
It was quite windy (cross wind)
I was running 65-68mph

 

I think that with that gearatio and the big DVs and injectors you getting about what I would expect .