Mario Theissen, BMW Motorsport Director
"Due to the thinner air, all engines lose around eight per cent of their output. This makes the engine wear a little less as the loading on the crank assembly is slightly reduced."
"The reduced atmospheric pressure costs the engines around 7% of their power output; as a result, the 62% of the lap spent at full throttle is equivalent to 56% at sea level. While this reduces the demands on some components such as the pistons, other parts of the engine, such as the crankshaft, are still subjected to significant loadings."
from: http://www.f1technical.net/news/13559
1st to to Tomba. what is the source of that information?
2nd to all: who is right? which parts are loaded more/less?
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