My money is that the seats on your 3 year old car are broken in...
Having driven both a 12 and 13 on a gravel road with plenty of holes, I can safely say I couldn't tell any difference until you hit a big hole. Where the 12 sort of wallows and lunges, the 13 pitched in a bit more and didn't bounce on the rebound; far more controlled and no hint of 70's cadillac.
Having driven both a 12 and 13 on a gravel road with plenty of holes, I can safely say I couldn't tell any difference until you hit a big hole. Where the 12 sort of wallows and lunges, the 13 pitched in a bit more and didn't bounce on the rebound; far more controlled and no hint of 70's cadillac.