Quote:
Originally Posted by COFronty
Yes, that is the thinking. 85=87, 87=91, etc. Because we have less oxygen in the air we don't need as high of octane.
BTW, I just got my advance done for free at the dealer! 
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Wait, wait. How high are you? The air does not have less oxygen in it! The air always contains 20.9% oxygen no matter what. Now when getting into higher alt due to the drop in barometric pressure and the laws of partial pressures there is still 20.9% oxygen but is spread out over a much larger area then at sea level. Thats why Mt. Everest climbers need to take supplimental oxygen because there is not enough in a combined space to fullfil the requirements of the body when placed in that type of stress situation. It's read in TORR, there specific counting system. At sea level the Torr level of 20.9% oxygen is around 160torr where as 20,000 ft could be about 45torr, same amount of oxygen in the air just now at this higher alt our body requires more red blood cells to do the same amount of work that it used to do at sea level.
Just want to get the facts right, No hard times.
oh hey SONOCO sometimes carries racing fuel. has octane of 100-102-105, they have it here in Melbourne Fl on 192 (exit 180) off I-95