That’s because when you are inside the cockpit, something other than GPU is holding back your frames and GPU has to render lesser frames per second which effectively means the utilization is lesser. In this example, it’s your CPU that’s stressing itself to render those glass cockpit instruments. When you are outside the aircraft, you’re not focused on those instrument panels so the CPU has lesser work to do and the target framerate falls on GPU leading to more utilization. Hope I could explain that well enough!