Michelin Pilot Sport A/S 3+ review after a week of driving. These replaced the OEM Energy Savers:
Short story, the mileage went from 41 mpg to 37 mpg (10% drop)
Tire pressure is 37.5 psi, filled by America's Tire on install.
My OEMs were 35 psi all the time, rotated at 10k during service.
When they were first installed, the ICE kicked in all the time. I had reset the fuel economy gauge on install. The grip was really good, there was a lot of resistance and I almost felt like I was driving with low tire pressure.
After I drove it a few times on the freeway, crossing 75mph, it seems that the tires 'smoothened' up a bit and the resistance on the road felt less.
The first 2 days, I saw 35 mpg which freaked me out a bit, but then the mileage got better. This is my usual day-to-day commute and random weekend driving.
The first day itself was dry and then it rained a lot at night so I got to test them in wet and dry weather. Everything about the tire is great so far, and I expected the gas mileage drop.
The tires are also pretty quiet and the cushioning is good. I've seen reviews where they claim to 'drone' on the freeway, etc but I haven't experienced any of that.
They definitely grip very well on turns. The OEM Energy Savers seemed to slide a bit on turns.
I'll update my experience in a month or so. Looks like I'll be keeping them unless something changes within my 30-day 'exchange' period.
Let me know if you have any specific questions.