2donkeys- my reference to altitude was simply to preclude someone saying that airplane operate at altitude, and cars on the ground. I was simply making the point that both can operate at similar altitude. I have experienced carb ice on the ground before
Who Has Control-look at my original question. I specifically mentioned that modern cars were fuel injected...and my question was about cars older than this...ones that had carbs.
Interesting responses..thanks to everyone who contributed.
Looks like cars with carbs either suffered from carb ice or more commonly were fed hot hair all the time!