[CamaroSpike23]

Originally Posted by Tactical Z

Actually the Camaro would fall faster seeing that it is heavier.

weight doesnt matter. they would fall at the same rate barring air resistance.

Originally Posted by shank0668

No, you are wrong, only matters surface area and how it would drop. If I have a 3in diameter ball weighing 2 pounds and another 3 in diameter ball weighing 10 pounds they should hit the ground at the same time. Right smarter older ppl?

should. air resistance is the major component in the equation

Originally Posted by JChen

You're right. The balls (and cars) would hit the ground at the same time. Here's one for you Mythbusters fans... What's more fuel efficient? Windows down or windows up w/ AC? I can't actually remember the correct answer.

both.... to an extent.

Running a car with air conditioning on is more fuel efficient than running with the windows down.
partly confirmed*
Tests were performed under varying conditions (55 mph versus 45 mph). The 55 mph test used a computer to estimate fuel efficiency based on air intake, not actual fuel consumption, and showed A/C was more efficient. The 45 mph test consisted of running the tank until it was empty, and showed open windows were more efficient.
*Because the original tests were inconclusive, this "urban puzzle" was revisited in episode 38: It is more fuel efficient to use air conditioning when the car is traveling approximately 50mph or more. Otherwise, windows are more fuel efficient.

Windows down vs. air conditioning

"Urban puzzle": it is more efficient, on a hot day, to run with the A/C on and windows up than to run with windows down (b/c of increasing car's drag).
Computer-based mpg measurements: * 11.7/11.8 with A/C on and windows up * 11.7/11.8 with A/C off and windows up * 11.3 with A/C off and windows down

So, according to the computer, it's better to use A/C with windows up.
This was too quick and easy for TV, so they decided to stage a seven hour marathon, race-til-you're-empty duel, with Jamie driving an SUV with A/C on and Adam driving an SUV with windows down. Though, once the safety inspector intervened, it was no longer a seven-hour marathon, it was a bit slower (45mph instead of 55mph), and a lot shorter (only 5 gallons each).
Jamie's A/C car ran out of gas first -- Adam's windows down SUV ran for another 30 laps -- completely contradicting the computer mpg estimate. Computer estimate based on air flow into the engine, so it would appear that it is unable to properly model the difference between A/C and windows down.