What about some so-called myths, are they myth or fact?

There are a lot of things said about a good number of things. It seems if they are said long enough it gets taken as fact. Let’s take a look at some of them and you tell me, myth or fact?

• Chocolate will cause you acne: (truth or myth?)
• On a hot day, you will get better mileage on the freeway rolling down the window and avoid using the A/C: (truth or myth?)
• If you have a healthy usual working metabolism (since some believe there is no ‘normal’) you can eat anything you want so long as you burn up the calories you take in: (truth or myth?)
• Crime always increases during full moons: (truth or myth?)
• Coffee with a good shot of some hot sauce will sober you right up: (truth or myth?)
• Mayonnaise will go bad once you open it if you do not refrigerate it: (truth or myth?)