2008 Ford F150, OE is 265/60R18 109S (truck capacityy 2065 lbs). For highway passenger use only, Discount tire recommended I replace the tires that were on it, a BFG K02 in 265/65R18 with the same size in a highway tire; I installed Defender LTX M/S.
I'd like a somewhat softer ride; it's 98% empty except for me and a passenger and an aluminum toolbox with maybe 100 lbs of stuff.
As I look at the tables for the non P-metric tire, it looks like 31 psi is "equal", truck capacity 2088 lbs. If it were a P-metric, it looks like the rated load would be carried at 27 psi ... but this is not a P-metric tire.
Is 31 psi a good thought? Why are P-metric able to carry more load at the same pressure vs "E-metric"?
NOTE that I've made the 1.1 correction factor for real loads, but comparing doesn't really require that.
Separate question; what is the rolling resistance relationship to pressure? Will I use more fuel at 31 psi than at 35 psi? In the old days, I would have unquestionably said yes, but with today's technology?
George
I'd like a somewhat softer ride; it's 98% empty except for me and a passenger and an aluminum toolbox with maybe 100 lbs of stuff.
As I look at the tables for the non P-metric tire, it looks like 31 psi is "equal", truck capacity 2088 lbs. If it were a P-metric, it looks like the rated load would be carried at 27 psi ... but this is not a P-metric tire.
Is 31 psi a good thought? Why are P-metric able to carry more load at the same pressure vs "E-metric"?
NOTE that I've made the 1.1 correction factor for real loads, but comparing doesn't really require that.
Separate question; what is the rolling resistance relationship to pressure? Will I use more fuel at 31 psi than at 35 psi? In the old days, I would have unquestionably said yes, but with today's technology?
George