Reduced performance at higher altitudes

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 6 seconds!

There are a lot more factors than just altitude. Were the original tests done by the same driver, as they were in Colorado? Was the weather (temp and humidity) similar or completely different for both tests? Was the same car even used for both tests, or different cars?

But I'd say it's certainly possible; altitude definitely changes things. Higher the altitude, the less dense the air. The less dense the air is, the less oxygen molecules will be sucked into the engine. That absolutely hurts performance. Those numbers do seem pretty crazy though.

It certainly affects the engine, but the figures you are talking about would make me wonder a lot :uhoh:

testing

Yes, the performance hit IS that drastic. I can't speak about those numbers in particular, but yes, it's a BIG difference.

Try going to some sea level location for vacation, and go running. You'll think you've got a turbocharger on your lungs.