35x12.5x20 A/T Tire PSI for best fuel mileage

[CRickyRam85]

So I am running 35x12.5x20 ProComp A/T Sports. Max PSI is 65lbs. The 4x4 shop aired them up to 37ish at install. I'm wondering what PSI I should try to give me the best fuel mileage as I drive 140+ miles round trip to work, 3 days a week. Any suggestions would be great. Thanks

 

[brianw0048]

Chalk test the tires.

I have Falken Wildpeaks 275/60/20 and run them close to 40psi.

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[JB1]

Great video from a member here at RF

 

[TatertotScott]

Best MPG only will be at max pressure. Best $/mile, chalk test.



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[McBroom]

Not a good idea on larger aftermarket tires and wheels. JMHO. Especially on a HD truck. They already ride like a loaded down hay wagon with bricks for wheels.


I love my truck!
Blue Mule 18 Ram 2500 4x4 C/C Off Road.

 

[6.7CumminsDrvr]

At least 41 psi.......

Check out the load inflation table if you have nothing better to do.


@37 psi your tires have a load carry capacity of 2,181 lbs.


https://www.toyotires.com/media/2125/application_of_load_inflation_tables_20170203.pdf

 

[AJAY]

I have LT305/70r18 which is comes out to 35.1x12.3x18. The truck is a 2013 Ram 1500 crew cab. I did the chalk test and have the fronts at 41lbs and rears at 38lbs when cold. After 30mins of driving they at come up to 44lbs and 41lbs. Hope this helps. When I am hauling or towing I air the rears up to 45lbs when cold.

 

[moparpeetie]

FUEL MILEAGE???????!!!! HAHAHAHAHAHA!!!!!!!!

 

[RoadRamblerNJ]

Top mpg will be on hard tires. You may shorten tire life doing it though.

Pay me now or pay me later.

My HD 2500 Tradesman CCLB 6.4 calls for 80 Rear and 65 Front. I do not like 65 in front. Makes the truck feel squirrelly, almost like it's oversteering during hi speed maneuvers. Scared the **** outta me, twice.
Now I run 80 psi all around, no more squirrelly. Yeah, it rides a little rough. It's a truck. You want a car like ride? Buy a 1500.
Oh yeah, screw mpg. Have fun instead!