Reduced performance at higher altitudes

[GoFar]

I live in Colorado, and I was watching these car reviewers from Colorado, stating that a 6.5 second 2012 Hyundai Azera hits 60mph in over 10 seconds. A similar video showed a 5.2 second 2013 Mustang hitting 60mph in over 8 seconds. Is reduction of performance that drastic here in Colorado (or any very high altitudes)? If that's the case, then a 2012 Nissan GT-R could hit 60mph in 5 seconds!

I've never really tried with my 01' LS because of the high mileage and certain parts not functioning properly (like the transmission bogging), but a few weeks ago, it hit 60mph in over 10 seconds (that was going slightly downhill too)!

 

[JoshMcMadMac]

Yes, altitude (air density) has a huge impact on naturally aspired engine performance.

 

[chris2523]

yeah, the thin air really hurts performance.
turbo charged engines, as long as they can maintain the boost, are less effected though.

 

[GoFar]

Let's say I turbocharged my LS to do 0-60mph in 6.5 seconds down in California (it's a V6), then I brought it up here. Would it only knock off 2 seconds?

 

[94m5]

...what?