A client of mine reacted immediately saying “Those bucket seats!” when I asked her what kind of car does she drive? She drives a Scion but the other family cars that she had to drive occasionally all caused her lower back pain after driving for an hour or two. All those cars were small models with bucket seats.
The advice is: To avoid lower back pain, do not buy any car that is shorter than you. Buy a car that is taller than you and that has bigger seats like the Scion, the mid sized Toyota, trucks, jeeps, SUVs, but not the small cars with driver side bucket seats.