I wonder up to what altitude, i.e. above sea level, the Diesel Grand Cherokee or any turbo diesel for that matter, will be able to produce it's full sea level ratings of H.P. and torque? It will obviously depend on the design of the turbo system. But, at least in theory, it should be able to enable these engines to produce sea level power well above sea level. At some point it will not be able to compensate for the thinner air and power will drop as it does in any engine. Anybody know about the general design of these systems to make any informed comments?