if you visit the tire rack website and choose a tire that offers a P rating, C rating and E rating you will see that the same exact E rating tire is heavier than the C or the P rated tire .
The additional cordage and construction necessary for an 80 psi ( E rating )just plain weighs more than a tire of 44 psi ( P rating ) shows up in the charts for almost all of the various tire models .
I choose to run a 265/75 R 16 load range E michelin tire instead of the stock 245/75 R 16E that came on my duramax .
I run those at 50 psi for 90 % of the time .
A benefit is that this set is at 60,000 miles and are not to the wear bars yet .
My duramax is a rough riding son of a gun .
When I want a smooth ride I become the copilot in her car .
I tried a set of oversized P 275/70R 16 Michelins on my previous chevy 2500 pickup and they did not last .
That was the stock tire on Toy Land Cruisers .
The P rated were more prone to road hazard problems than the E .
I only tried that once .
E rated tires have more longevity and have in my actual experience eliminated all road hazard punctures .