My pc generally averages around 35 - 50 fps depending on weather, panels, traffic etc.  Therefore what should i be setting the target framerate as?  If I have it set too high or low will it actually hinder my performance? - my pc specs are ample for fs2k2 and i always have scenery and traffic maxed out without any jerkiness.   

In short, does it really matter what i set the target framerates as?