yes, use pathtracing if you have a simple open scene like this one, it will gives a more realistic result but for a litle more time than photons,
notice that there’s few light panels and they are directly illuminating the car, so I have set the depth (light bounce) to a value of 3 on the pathtracing options, this will speed up the computations.
for my render I used pathtracing and it tooks 71 min to compute on a q6600 cpu
but like DarkTide said that we can get better results with the same render time !
I don’t know how ! 
http://www.yafaray.org/community/forum/viewtopic.php?f=6&t=2622&sid=9e870992041cca5a0038b08cf48d68bd