In rural areas in the lows of 40%. In towns and cities always 80% and above. Especially Athens I get FPS drops (to below 30FPS at times) when synchronizing with Ikaros. Lowering Shadows and Ambient Occlusion helped tremendously. I think it's the shadows draw distance that kills the FPS.
With the i7-4770, you should see a slight improvement in average FPS (5-7) but much smoother lows and less stuttering, especially in cities where I see my CPU usage always near max, 4c/4t would be overload imo.