Hi karnog. Just another thought: If you are looking for a smooth/quiet tire, you would be better off with a good quality All-Season tire which is geared towards smoothness, quietness and ride comfort. That is
not what Summer-only tires are designed for.
Summer-only tires are usually strictly high-performance and ultra-high performance rated tires. They are designed for performance cars/sports cars which are driven strictly in warm weather. They will wear fast and not be a "smooth, quiet tire", since smoothness and quietness are not prime concerns for your average performance/sports car owner. High speed handling is.
And let's face it, high speed handling is not a prime concern for most Town Car owners.
The reality is...A good, ride-comfort oriented All-Season tire will provide a smoother, quieter, softer ride and better tread life etc., than a summer-only tire.
Also...once the temperatures drop below ~40°F, you will need to swap out those Summer-only tires for your winter tires, since simply driving once on them in temps of 40°F and below can/will damage them. It can also be dangerous, since they quickly lose grip in freezing, below freezing weather.
In fact, you will actually need to swap them for your winter tires before the weather will hit 40°F or below (it only takes once to damage them). So you will have little leeway to drive into the fall/winter, according to when it gets cold by you. Essentially, if you have an odd day where the temperatures drop below 40°F in the fall, you will not be able to drive your car.
If you do some research on Summer-only tires,
using expert tire sources and the tire manufacturer sites themselves, not Internet opinions, you will find all of these warnings and information. A good place to start, would be to utilize the Research section and the "Tire Decision Guide" on "The Tire Rack" website. The Tire Decision Guide will help you find tires that fit your priorities, which are smooth, quiet tires:
https://www.tirerack.com/content/tirerack/desktop/en/homepage.html?gclid=EAIaIQobChMI0dyhv-Hb_QIVFc3ICh308wsDEAAYASAAEgLQnfD_BwE&ef_id=EAIaIQobChMI0dyhv-Hb_QIVFc3ICh308wsDEAAYASAAEgLQnfD_BwE:G:s&s_kwcid=AL!3756!3!347550706734!e!!g!!tire rack com&gclsrc=aw.ds
And the Discount Tire website is also good, as "oktowncar" recommended.
Let us know how you make out and good luck.