Quote:
Originally Posted by Snowwolfe
I wouldn’t worry about it. Drove my 2013 C7 with an A&A super charger for 3 years while we lived in Colorado Springs with no ill effects. Your going to lose about 3% of your HP for every 1,000 feet in elevation and not much you can do about it. You can’t change the density of the air
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This.
I've noticed when traveling through Colorado that gasoline sold at altitude runs lower octanes (regular unleaded is 85 octane in places) and the reason is air density at altitude. Running 91 will have the same net effect on your car at altitude that 93 would have at or near sea level.