Octane at altitude

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kizashigal
Posts: 116
Joined: Sat Jul 30, 2011 4:48 am
Location: Colorado

The owner's manual says to use 87 octane, but would it be okay to use 85 at altitude? Would performance or MPG be affected? I've heard for every 1000ft of altitude you can decrease 1 octane level. Thoughts or experience with different octane levels at altitude?
2011 Kizzy SE AWD Deep Sea Blue

*drive it like you stole it*
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~tc~
Posts: 999
Joined: Tue Mar 29, 2011 3:33 am
Location: Houston, TX USA

Yes.

Snce there is less oxygen, there is less propensity to detonate, so you can get along with lower octane
2011 Sport SLS with nav Black Pearl Metallic
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