The Lycoming turbocharged 540 engine in the Matrix is essentially the same as in the Mirage, but air is not tapped from the turbo compressors to pressurize the cabin. That means the Matrix easily matches the speed of the Mirage, but pilots will need to use supplemental oxygen above 12,500 feet in the Matrix. The reality is we all spend more hours flying with a headwind than with a tailwind. The math just works out that way. So most of the time a Matrix pilot will be happy flying at an altitude that doesn't require oxygen into that lower headwind. When the wind turns big in your favor, it may pay to climb and don the cannula. And on every flight, the cabin size and baggage capacity of the Matrix are always the same as those of the Mirage, but there is more payload available because empty weight of the unpressurized airplane is less.