In any driving game I can tell the difference between 40+60 and also 60+80. Just like in a real car (when you leave your house) if you jiggle the steering wheel back and forth. IF your fps is low, you now start steering with a delay. At the same time the gpu and the game engine can draw a new frame it accepts a input from your controller/keyboard or mouse. What don't you people grasp about this ?
edit: Everyone is aware about response time in monitors , 2ms vs 5ms vs 8ms ? Well there are 1000 milliseconds in a second. Its the same principle , response time is lessened in gaming (controlling your car,gun,3rdperson) with higher fps.
I also will change view in driving games , that give me the quickest steering response, and that usually is the view that delivers the fastest fps because of graphics being drawn.
IMO, this is another factor in the balance between IQ and fps. And the reason why we need more powerful gpu cards. Some people want it all.