Don't buy the A/S 3's as recommended by the members above. They have there place, but not for you since you said your easy on tires and
go 75 MPH in a straight line 95% of the time. The A/S 3's will have a shorter life, provide less fuel economy and ride harsher than what you have now.
The Michelin's on your car are a low rolling resistance tire and the A/S 3's are not and you can expect to take a real world hit in fuel economy.
I'm not taking a silly 5W20 vs 5W30 type fraction of a single MPG either. It can be over 1 MPG. Account that cost in extra fuel used in a 50k span.
And what happens if you have to have to deal with an emergency situation at 75 MPH? Or hit an unexpected wet patch around a blind corner?
Grip is the most important thing a tire does. When you sacrifice it, you're accepting an extra measure of risk not only for yourself but for others. I guess I can't speak for everyone, but I don't have the cojones to say that's worth 1 MPG out of 30.
"Shorter life" means it'll take less time to get down to the wear bars. That's probably true. But even at the wear bars, an A/S 3+ will still work better than those other tires will with most of their tread.
NVH: Again, probably true. But we're not talking about a runflat winter tire here. The A/S 3+ actually has a pretty soft sidewall as performance tires go.
In sum: The MPG and NVH advantages of those other tires are minor if not insignificant. Their tread life advantages are a false economy. But the grip and traction advantages of the A/S 3+ -- and thus its safety advantages -- are huge. If that's not a no-brainer, I don't know what is.