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Originally Posted by MattR
The engines don't care what altitude they are run at - it only cares what the air pressure, temperature and humidity is. Sea level at 30.15 inches baro is exactly the same as 4500 ft at 30.15inches, (Which is exactly where the Barometer sits for Reno and Oakland, Ca today!) as far as the engine is concerned. . To me, an altitude adjustment is just as necessary as a temperature and humidity adjustment
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Actually the barometers are adjusted for altitude so 30.15 on the baro up here is not 30.15 on the baro in SF. if you look at weather station at mt rose vs SF they are always very very close, yet the real air pressure isn't that close.
But i agree with the rest of what you said. PAX is set and if you get to drive in 10F or 110F that's what you get. you don't get a Rain/Wind/Temp modifier so why altitude ?