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Message: [QUOTE="dirt bike dave, post: 1402786, member: 18302"] Another variable you did not mention is barometric pressure. It can change quite a bit. To see the relative effect on power of various weather and altitude conditions, you can play around with an online calcualtor like at this link [url]http://www.csgnetwork.com/relhumhpcalc.html[/url] It appears a difference between a barometric pressure of 30 inches and 29 inches can make a bigger difference than a change from 50*F to 80*F. [/QUOTE]