Rendered in Yafaray (2.2 hours). Enjoy!
Hey try with render with pathracing
Settings:
Lighting method: pathracing
Caustic method: Path
Path samples:25
Depth:5
Anti aliasing settings:
Mitchell
Passes:1
Samples: 32
Your material is a little bit too shiny:
I’m always using 0.13 reflection strength and 100-200 exponent for car lacquer 
ummm… those are my exact settings except my reflection is .14. Its not all about the render settings, its my setup. Cars will look more reflective when lights are pointed at them or the world setting is emitting light. Don’t get me wrong, thanks for the critique, but don’t try to be the authority on a program when you are not sure of the issue.