Tire pressure when it's cold

I can't remember the last time I saw the hood up and a pre-trip going on at any truck stop. They do teach that stuff in truck driving schools but I think "trainers" anymore un-teach that stuff.

 

Well I tilt my hood and looks things over. But most time it out in the front lot of the ts. Try to avoid back lot when possible, rookie drivers seem to like hitting my st8 truck.

 

Tilting a hood in a truckstop is putting it at great risk of removal. But I still do it every day.

 

They've changed the data they had out since the last time I looked... this is new since last year. There's this general warning on pg 41 of the X-One service manual, that appears to replace a more general discussion of tire wear and inflation practices they had in the older issue of this.

http://read.dmtmag.com/issue/44899

 

Well thanks. But we were talking about dual tires , not X Ones, and just a few posts ago you can read for yourself what Not4hire referenced and what Michelin says about inflation pressures for their tires.

You and Richter should get together and start a big thread of your own. You could call it:
"Low RR and High MPG cause we know so much"

 

It was about XDN2's which are wide singles (not duals if you recall,) and have always been covered in the same discussion Michelin has on X-One's.

No need to get snarky about this! I've kept track of all of my changes to my driving technique, and the effect on fuel economy. Being educated at an engineering school does that to ya.

 

No need to get snarky about you're engineering school either iron. I've seen more people I graduated high school with go through college, both community, and major universities. That little slip of paper doesn't make you a genious or a know it all nor does it mean you keep track of things better than any of the rest of us.

Tell me this. What pressure back when you had a truck with duals were you running in those?

 

110 nominal... per the sticker that Freightliner puts on the door frame, and the carrier's requirement. When I started keeping very close track of my fuel economy it became obvious. I had Goodyears (forget the model) and Micheline XDAs on that truck... similar effects on both brands of tires. Most things will effect fuel economy in the couple of tenths per mile range, but if you add enough of them up you can make a fairly good sized dent in the total effect on how efficiently you're operating the truck. Wide singles show the same tendency to decreased fuel economy with lower pressures. For the record, I get adequate tire longevity, and I don't see odd wear patterns at the pressure I use. It works for me, your mileage may vary.

...and yeah, I'll agree with you on the effect of higher education. It doesn't necessarily mean that the recipient gets any benefit, unless they put that education to work. One of the techniques one may actually benefit from is something called generically "process improvement." Write down the numbers describing the parameter you're trying to improve religiously... only change one thing about the process at a time, keep track of the before and after change numbers. Implement the change if it's beneficial, pitch it if it isn't. Pretty simple. The key is you really have to write this stuff down... as long as it's rattling about in your head it's a moving target.

 

Actually, XDN2s come in both XOnes and standard tires. The fact that I posted that I was running 80 PSI and showed, via a link to Michelin's inflation table for standard tires in an 11/22.5 size apparently got past your engineering degree.

Hey I'm a high school drop out ( I was bored) and so meticulous in my record keeping and analyzing of data that I've even tracked every fill up on every truck for almost 20 years. You're effing ####y.

 

No... just highly allergic to BS. Especially if its generated by some pencil-necked geek with a pocket protector and coke bottle glasses who most likely has never driven a large truck. Been doing this for 20 years and never got curious about how you were doing things, eh?