I agree, I run mine at max press and it gets much better mileage.

Less press is simply for better ride/handling.

It's a diesel truck not a sports car. I don't need r/h, I need mileage.

 

Im leaving to drive to alabama today from oklahoma city and im gonna be checking my mileage! Last week i drove to dallas and got 15 mpg

 

A light foot and cruise control got me 23.5 on the Lie-O-Meter yesterday evening. 53 mile drive empty. You CAN fool these trucks into good mpgs. It's just not very fun.

 

Wow. You guys are nuts! I hope you don't drive in hot areas.
I'd hate to read about a CTD blowing a tire and flippin' off a freeway.
I live in an area where there is alot of climate variation. In 2 hours I can drive anywhere from sea level 110 degrees outside, or I can head the opposite direction and get to 5500 ft with below 30 degree temp. If I ran max pressure in the hot area, I'd have way too much pressure and risk blowing my tire, and If I ran max up in the icy areas, I'd fly off the road.. (i know from experience on that one). I think I'll stick closer to the recommended pressures.

 

IIRC, for every 10° rise in ambient air temp your tires gain 1 psi. and the same for 10° drop you loose 1 psi.

I run my fronts at 70 and rears at 60 year around. I check them about once a month.

 

RDR, Yes I do run the tires at full psi advertised on the tire. I do drop 5psi. out of the rears for a little "hind" comfort, but that's why I have the adjustable Rancho's on the rear. My 295's are a load range D tire that run 65psi, but have the same load rating of a load range E tire that are designed to run 80psi. I only think about dropping pressure if we are gettin' a good ice-up in Oklahoma. I will end up going to the Toyo Opencountry At in the 285/75/17 size on my next tire change. The reason why is because I do not need agressive treaded tires for what I have to do with this truck and the Nitto Terra Grappler's that I have are wide in the siping areas and do make some noise. Now The Toyo Opencountry AT has a tighter tread pattern and closer siping, the tread design is the same, but the pattern is tighter and closer together = quieter and probably wears longer. JMO

Wood

 

For all you guys lugging your engines below 2,000 rpm all the time, read the post by the guy that just had his truck in the dealer for severe carbon build up. You got to stand on it once in a while (like once a tank) to get all the crap blown out.

Peter

 

Nonsense. I've got 127,000 on mine now with no such issue. And it's not the RPM anyway. Mine runs at about 1700-1800 on the highway. You don't have to "stand on it" to make it run right.


John

 

You got a link for the post?

Wood

 

Wood,

It's in this section and down a few threads. (22K and carboned)


John

 

Peter, I don't think that I am going to give alot of credibility to the diagnosis that the dealer gave that guy on that truck issue. If I run my truck all day over 2k rpm's I'd have a laundry list of speeding tickets. My opinion on his issue is not from running low rpms too often though. There is something else there that is missing from the equation, but I am no expert. I do know that there is a fine line to finding the best mileage possibility out of each truck which run different setups whether it be stock or aftermarket stuff, tires, programers, 10 foot lifts whatever, but it is there to be found and everybody is different somehow. As for basics I think fully inflated tires, running at or just under 2K rpms. My magic rpm range seems to be 1700 for optimal mileage and it ain't fun! JMO

Wood

 

I dunno about carbon buildup, but every time I change my fuel filter I fill the canister back up with 100% seafoam. I have the engine warmed up already when I change the filter. I put in the seafoam, close it up, start the truck up, and go screaming down a remote road. The idea being to get the rail pressure way up and clean out the injectors. Funny enough I always get much better fuel mileage for the first tank after a filter change. By about 1.5 mpg.

 

that carbon build up and luging below 2000 is absolutly not true

 

Heck if I want to burn out the carbon I just hook up to a 4-5k trailer and take it on a nice long drive. I also don't believe in using Alcohol based additives with every fuel filter change.

 

1700 rpm aint lugging a diesel.....always wanted to know how you can lug an auto? Manual is a can do...auto not!