Just thought I'd post this up here since we all want better MPG.
Was only getting 9.5 towing 11.5 city\county driving and getting pretty sick of it. With 195k(184k when I got it) on it. This was my first time adjusting the valves on a diesel engine and it is super easy. Every set except #1 intake was .07-.018 out of spec. Truck runs so much smoother, better power, less smoke and best of all better MPG, 13.5MPG hauling *** down the freeway(65-80mph 75mph\avg.), I don't know towing mpg yet but I'm sure it'll be better. Hope this helps anyone who is looking for some better MPG.
Ted T.

 

As long as you believe it.

 

I also had my valves on my 98.5 adjusted, I also notice a diffrence my truck run better 20.5 mpg

 

Smokin98.5- I am planning on adjusting the valves on mine at about 120,000 miles...almost there. What special tools did you need and where did you find the instructions on how to do it? Thanks in advance!

 

Download the FSM. It has the instructions for everything.

 

Got a link by chance? I am pretty close to having to do that myself.

Thanks in advance!

 

I found a post somewhere on DTR with all the instructions on how and whats needed. Tried to find it again but couldn't. Look and you will find it somewhere.

 

Here it is :\
https://www.dieseltruckresource.com/...n&onlynewfaq=1

 

Congrats on your increase but your unloaded mileage(@13.5mpg) is WAY low for your vehicle...

 

Fyi my 98.5 will get around 20-22 doing 55-75. Towing last week I got 15.5 on 375 mile trip, 1/2 with just 5500lbs and the other half with 9000 in tow.

 

well im glad everone else is getting close to 20 mpg. i can only get about 16 out of mine and thats babying it around

 

What gears do you have and how fast are you going? I can get 21-23 going 60-65 doin 75-80 I get 16. I also have 4:10 gears that are coming out soon.

 

Thats about what I got out of my '01.5. I had 4.10 gears, leveling kit, and 33's...highway mileage at about 70-75 was 16.5 hand calculated on a long trip. I'd usually be 14-15 around town. Now I have a '04.5 reg cab and it does a little better. Everyone always says they get better mileage than me...I don't think I could coast either one of my two cummins I've had down a hill in neutral and see 20+ mpg for a tank but thats just my experience.

 

im running 3.55s with 285/75/16s and im usely never over 70

 

boy i better do mine 214k and i never did them. anyone in northeast ohio want to help me? par12730@sbcglobal.net