Those of u with 10 ply tires
12-31-2012, 07:51 PM
#31
Senior Member
I am running my LT275 70 18 Trailcutter studded winter tires at 36 psi and they seem to ride just fine. I don't get a whole lot of dry pavement time with them though. I did lose a bit of fuel economy with them, but I'd say idling it for 10-15 minutes a day to warm it up is mostly to blame for that.
01-01-2013, 08:52 AM
#32
Senior Member
Yep
Mine came from the factory with Load range E tires also. I picked up the truck on Friday and the very next day my TPMS light came on saying the pressure was too low. I pumped them up to 60lbs all around.
01-01-2013, 10:42 AM
#33
Grumpy Old Man
The only F-150 factory tire with load range E comes on the pickups with the HD Payload Pkg, which includes LT245/75R17E tires on 7-lug 17" rims.
Optional on most 4x4s with off-road pkg is LT275/65R18C (not E).
When you change tires from the specs that came on the truck, you screw up the computer that computes trip mileage and MPG. Even going from LT275/65R18C to LT275/65R18E will change the tripmeter accuracy because of the difference in tire revolutions per mile. Goodyear MT/R load range C has 643 revs/mile. BFG AllTerrain load range E has 656. That's a 2% change in speedo and tripmeter accuracy, which means your MPG calculation is also going to be off about 2%. Going from P265/65R18 to that load range C Goodyear MT/R of the same size will be more than a 2% difference in revs/mile.
So if you change tire specs, then you need to have your Ford dealer or speed shop calibrate your speedo to use the revs/mile of the new tires. That's the only way you can be sure of the actual change in MPG.
Optional on most 4x4s with off-road pkg is LT275/65R18C (not E).
When you change tires from the specs that came on the truck, you screw up the computer that computes trip mileage and MPG. Even going from LT275/65R18C to LT275/65R18E will change the tripmeter accuracy because of the difference in tire revolutions per mile. Goodyear MT/R load range C has 643 revs/mile. BFG AllTerrain load range E has 656. That's a 2% change in speedo and tripmeter accuracy, which means your MPG calculation is also going to be off about 2%. Going from P265/65R18 to that load range C Goodyear MT/R of the same size will be more than a 2% difference in revs/mile.
So if you change tire specs, then you need to have your Ford dealer or speed shop calibrate your speedo to use the revs/mile of the new tires. That's the only way you can be sure of the actual change in MPG.
01-01-2013, 01:35 PM
#35
Senior Member
Exactly, I have the HD payload and Max towing packages, with 17" tires and 7 lug rims with LT245/75R17 tires, load range E. I will ride them for about 70,000 miles and then get new ones.
01-01-2013, 01:58 PM
#37
Senior Member
45 PSI BFG AT's in 265/70/18 flavor
Rides harsher than the stock GY SRA's and took an approx. 3 MPG hit
Rides harsher than the stock GY SRA's and took an approx. 3 MPG hit