Originally Posted by 767IJP
Density altitude shouldn't be much of a concern. Certainly not to the point of making your car drive " like crap".
Piston airplanes. Certainly suffer from this but we are talking about pressure altitudes in the thousands of feet.
I see you're located in Toronto so density altitude would have zero effect.
A higher temperature causes a higher density altitude which will reduce horsepower due to a lower oxygen content.
A 100f day at sea level is same as being at 2500 ft altitude.You loose about 2% power for every 1000 ft of altitude increase.Add in the other effects of higher heat on the operation(a/c compressor ,higher electric load due to fans)you will notice the difference in performance.Turbo or supercharged engines are worse for this with power loss vs heat.