I do a lot of highway driving and always get close to or over 20 mpg driving 70-75 mph with the AC on. I play in a band and it hauls an upright bass, big speaker cabs, bass guitars, amp heads, etc. all at the same time very comfortably and with plenty of power at all times and even fits my wife. The car is very reliable, and the motor uses less than 1/4 of a quart of oil in 3000 miles with 96000 miles on the odometer. This car is a blast to drive and I get comments all the time, these are becoming classics and rightfully so. I'll take one of these over a roadhog SUV anyday and you can even see over them when you are in back of them. They ride like but handle much better than the old boats.
Acceleration is phenomenal for a car this size and especially for one that gets good gas mileage. The car rides very well, handles well and surprises the occasional kid who thinks he's going to blow off this big grampy car at a light.
The only improvment I can think of is for Detroit to make them again!