new to the board-- just test drove a 2019 3 sedan preferred

As my username suggests, I currently drive a 2009 Honda Civic Ex-L -- perfectly decent appliance. Having turned 50 last year,I'm looking for something a little more fun to drive on the weekends. Want something reliable (which the most recent gen 3 seems to be based on what I have read) and with good gas mileage (the Premium sedan's cylinder turn off seems intriguing, but am a bit skeptical of Skyactiv X, both in the possible kinks and when it might make it to the US).

The car was fun to drive. Peppier than my current Civic. Love the exterior and interior.

I'm not a big fan of the current Civic's looks (and it doesn't have blind spot monitoring, just that Lanewatch thing). Based on folks' past experiences with the 3, what should I expect as a (hopefully) future 3 owner for maintenance costs (particularly since I tend to keep cars for about 10 years), durability, dealer service/maintenance, etc? My car is garage kept, take the car for scheduled service to the dealer, not a lead foot, mainly weekend driver on highways.

Thanks!