slighly-fancy feeling sedan, good mpg

I agree with the member above that a Toyota Avalon is one great choice. I actually just purchased a used Lexus ES300h. The price premium for the upscale nameplate and hybrid platform is reduced because of buying used, and if you chose to do so, you could have it serviced anywhere that can service a Toyota (for maintenance, of course, not bodywork). I love my Lexus, and I honestly think it's worth it so far. The car is roomy, comfortable, well-appointed, powerful (depending upon what you're comparing it to), and very fuel efficient.

My mom drives a 2017 Avalon Hybrid Limited and she loves it. It is the same platform as the Lexus ES, but you don't get the L badge. It is very torquey from a stop, giving the feeling of a V6, but it really has a 2.5L and a battery. It is a big car and is probably the closest new car you can get to driving a boat. It has a lot of body roll, but it totally feels safe to drive, nothing unsafe about it. With this body roll comes a suspension that soaks up bumps better than almost every other car I've been in. Super quiet and luxurious. I drove it to work one day and got 41 MPG going a constant 80 mph. You feel like you are going faster than you are; I caught myself going 95 mph, but it felt like 75 mph.On the 2017s and newer, all the active safety features are standard on every trim. It is an elegant looking car being a car designed in 2013. It also comes in a V6 that gets much lower MPGs and is a little quicker.

The Buick is not as good as the Avalon because of reliability alone, which is "Poor" for the Buick. Also, you don't get the brand rep of a Toyota or Lexus; you get the reputation of GM. I'm not saying the Buick is a bad car, but it certainly isn't as good as the Avalon. Not everyone needs AWD. The Avalon is available in a hybrid that gets 41 mpg.

The Mazda6 is a great car, but I don't think you would want one because of the excessive road noise and the ride is firmer.