I drive my little Fiesta 1000 miles a week commuting to work and school. It does fine at speeds between 70 and 80 MPH. For passing or steep hills you do need to downshift to 4th. It handles high winds well for a light car and corners very well. MPG range is 35 to 42. The advertised 38 is the norm.
23,000 miles so far without issue.
I like the mileage and the sinc radio system. The ride is quiet for an econobox.
A 6th gear would be nice and reduce RPM. I am 6' tall and drive this and all other cars with the seat all the way back. I wish it had a bit more led room in the back seat area with the front seats all the way back for when I have the kids with me (this is mainly a commuter). Also, the driver's armrest needs to be wider.