Anyone running LT-rated tires on Ford Expedition?

Tire size is 265/70R17. I haven't seen anything in a D rating, at least not readily available.

The other thing that crossed my mind last night is how will an E rated tire affect the TPMS if the sensors were designed for P rated pressures?

As for fuel mileage, I've already noticed a 1 mpg loss by going with A/T tires, so I suspect I will gain some by going back to an All Season tire, but may lose some since LT tires would probably be heavier.