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Old 03-11-2013, 11:24 AM
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540iman 540iman is offline
resident, old fart
Location: N.W. Indiana
 
Join Date: Sep 2008
Posts: 1,502
Mein Auto: 2002 540i sport
ABSOLUTELY! But, not by enough to matter a great deal if you are say in Denver at 4000'
This thin air will be reflected in fuel mixture more than in coolant pressure. Car learns and can negate a lot of it, but mileage will suffer as will power.
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