This is my third Honda. I loved the other cars (Accords) and bought the Civic mainly to increase gas mileage due to long commute and high marks for reliability and safety. But, there are several things that are truly annoying. The main problem is the front seats are very uncomfortable. After 45 mins of driving my back was hurting due to the hardness of the seat and the way it pushes in your sides to mold you into the seat. There's no "give." Another big problem is the side door frame blocking you view while driving and especially while turning. Not being able to see the front of the car (end of the hood) is a big problem in trying to park, turn etc. Maybe you eventually get used to it.
Gas mileage is great. Reliability and safety factors were the selling point for me. Many have commented against the split level dash with speedometer up higher. Actually it's a good idea once you get used to it. Easier to see and doesn't take that much of glance to check it while driving.
Redesign the front seats to be more comfortable. Redesign the frame so the left side door frame does not block side view while trying to drive, esp. turning.
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