Super Single Tires

They state "loaded radius" which would differ from "free standing" radius, I suspect their information is correct. The Singles must have less sidewall deflection than a set of duals when loaded.

 

With super singles in a tag axle truck on a 7000 pound load from El Paso to Ontario, CA I got 9.1 mpg. I wasn't expecting that.

EDIT: did 65mph, which is what it's governed at

 

Yup, you guys think our trucks are more advanced that's why we get so much better mpg's! Truth is the layout of the truck is just as important, a tag axle is way more fuel efficient than a double drive, not only because of the lack of frictional losses but also less drag !

Also we have supersingles on trailers here, they mean at least .5 mpg's ,

 

The 7000 pound load playd a part in that mileage too, throw a 50,000 to 56,000lb load behind the same truck and see what it gets. I'm not trying to be negative but alot of guys come on here bragging about high MPG but most of them barely run the minimum speedlimits on the interstate and are carrying less than half of a full load.

 

12' wide 87K Gross weight permitted load from IL to GA this week got 7.49 mpg.



Very unaerodynamic and heavy. I also use the Michelin X-One XDA drive tires that are the little larger 455/55R22.5 ones that have a higher load rating of 22,000 lbs per axle for the heavier loads. I run them at 120lbs of air pressure and use tire sensors to check pressure/temperture at all times.

Pulled same trailer 3 years ago before I started driving conservatively and made mechanical fuel saving improvements to my truck to only get around 4 mpg.

On a 1,000 mile run that is 117 gallons of fuel that @ $4 per gallon is $468 on 1 trip over a couple of days. Nice bonus for my efforts.

Note: Should have been higher MPGs after finding brake dragging slightly on trailer with temp gun around halfway thru trip.

Temp gun is a great tool to have on truck to check tires, hubs, brakes, etc. for problems. Bought mine at Harbor Freight for around $35: http://www.harborfreight.com/non-contact-laser-thermometer-96451.html

 

Now that's impressive

 

The temp gun is a great tool. I had some issues with wheel bearings going out on my step decks. I never had an issue with them for 10 years then randomly had 2 bearings go-out OTR in a week. Bought a temp gun and started shooting every hub as they came in the yard to see if they were running hot.

 

What is neat about that temp gun I posted is you can be 8' away and read the temperture. Just pull the trigger and put the red lazer dot on what you want read to get temperture.

They say you can find a bad injector in advance by checking individual cylinders on the exhaust manifold, but I have not had that problem yet.

 

Fully loaded it can be anything from 6.6 to 7.8, depends on how many hills i get, the wind, blah blah blah. But this tag axle truck is so much more efficient than the twin screw i had up until three weeks ago, they both have the same setup with super singles everywhere.

The downside is when you get to a dirt lot and you try to back up and you are just sitting there like a moron spinning the tires lol no magical button to get all four to spin, all you can do is dump all the weight on your only living axle and hope you don't dig yourself in and look even more ridiculous, or just pull out of there and park on the shoulder lol

 

that's why anyone doing this should spec lockers in the live axle so they have the ability to get at least 2 wheels.. one on each side.. going. dump the weight on the dead axle, lock up the live axle, and do your thing.