Usage - GPU/CPU versus Locked FPS

On my miserable system if I set FPS to 21 my gpu usage is  around 35% but my CPU is 80%.  However, if I set FPS to 40 the GPU goes to 80% and the CPU moves  to 40% (over all 4 cores). It seems that people with financial restrictions might adjust the FPS limiter to achieve a load balance between the CPU and the GPU. This is over the Pacific Northwest  mountains in ORBX.

P3DV2.2