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Thread: Octane and altitude question

  1. #16
    Registered User lkchris's Avatar
    Join Date
    Mar 2003
    Albuquerque, NM
    On cars at least, the hot wire or whatever is in what's called an air mass meter and for sure the density of air is less at altitude and the meter measures less mass.

    It should be a given that less horsepower requires less fuel, although carbs can't deliver on that promise as efficiently as FI. Constant velocity carbs are best at it.

    In addition there's less aero drag on the whole bike and in mountains and hills there are lots of downhill stretches that require basically nothing from the motor. That is, the motor does less work, which is good for consumption, too.
    Kent Christensen
    '12 R1200RT, '02 R1100S, '84 R80G/S

  2. #17
    Join Date
    Jan 2009
    Stowe, Vermont
    Quote Originally Posted by bikerfish1100 View Post
    which leads to the question- what is your normal running rpm?
    Normally 3k at the low end. That day it was 4.5k or higher. Remember this was a GSA with 200# of hack, 75# of dog, 50# of gear, another 35# of beer, water, tools and kibble.
    '07 R1200GS for solo rides
    '10 R1200GSA with Hannigan dual sport sidecar for rides with Barley

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