Fun fact - air density has almost no effect on the speed of sound. What does have an effect is air temperature. These are related in the free atmosphere because the pressure is relatively constant for any given altitude.

How many nmpg does the Hummer get?

No, you’ve got to take the blame for this - the reason it’s “a thing” in the first place is because you decided to cross-post your comment hate. Whatever you might accuse Alissa or Gawker of with their click bait cross posting, your just as responsible for your star-baiting hate rant.

It would have been nice of him to lock the frigging lockers on the Jeep and show just how much better it is than the 110 off-road in factory-stock form.