I wouldn't think it would make much difference in ride quality to be honest. I wouldn't have expected that harsh a ride on 17's with 45 profile tyres. Maybe the Camry just had even softer springs and shocks. As far as noise goes, it would be more brand related than the change in profile, I've found the falken FK452's on mine much quieter than the eagle F1's they replaced. No idea on consumption, in theory it would work the car a little harder to get rolling with a larger circumference, but you might gain it back cruising at a teeny bit lower revs.