I just got back last night from a trip from Wisconsin to Florida and back in this car. 2700 miles round trip in 9 days (3 days driving there, 2 days driving back). My Dad and I had a couple 14 hour days in the car, and a few shorter ones (8-10 hours). I drove the whole way, while he slept on & off with the passenger seat laid back. He didn't complain once, and I didn't ever feel uncomfortable. We are both 5'8" tall, for reference.
The most wind noise was heading west at 70mph into a 25mph headwind from Indianapolis, IN, to Bloomington, IL, but the radio outcompeted the wind noise. It was a nice drive.
View my fuel log 2014 Mirage DE 1.2 manual: 53.1 mpg (US) ... 22.6 km/L ... 4.4 L/100 km ... 63.8 mpg (Imp)