Staryoshi- if you are seriously concerned about minimizing power loss at high altitude, you should consider vehicles with turbocharged engines (difference is huge vs NA).
30 extra horsepower and 34ft-lb more torque with a minimal weight gain will be sufficient for my needs. I don't care to pay for premium fuel and I'd prefer the economy of a 2.5L NA engine over a 2L turbo. The CX-5 is a great all-around vehicle except for the power-plant (Which is less of an issue at sea level, but still present) The 2.5L engine will address the largest issue I have with it. I certainly don't expect to fly off the line - the 2.5L will resolve much of the slowness with acceleration onto the interstate and when tackling inclined gradients that I've experienced during my time with the CX-5.