BTW - OP, there are ratings between P and E.
C and D are in between.
I prefer C because tough enough, but still ride decent enough and get decent enough gas mileage.
P will ride the softest, most comfortable, and get best gas mileage, but aren't quite as capable off road as a C because C are tougher and have deeper tread for more traction.
However, I think a P would be fine for you. P or C would be fine for you.
Avoid D and E like the plague, IMO.
Warning: Sometimes I edit a post a few times to get it how I want it.