1A: 25%.  There are two reasons to keep your tanks at least 25% full.  First, a full tank reduces condensation that can plug up your fuel line.  Second, if road conditions take a turn for the worse, you’ll be glad to have more fuel than you thought you’d need when you left for the trip. 

2A: 10 times longer.  Increase your following distance accordingly. 

3A: All of the above. Weather conditions can change throughout the day, so check each time you stop for fuel or a rest break.  Clear accumulated snow, ice or road grime off your lights and reflectors.  This helps you see better and increases the chance other drivers will see you.  Keeping your lights and reflectors clean can also help you avoid getting pulled over.  Observable defects are the primary reason for DOT inspections.  The bad weather will already be slowing you down, and a traffic stop will only put you farther behind.  Experienced drivers often carry spare bulbs and fuses, as well. 

4A: Ease off the accelerator, steer toward a reference point, and into the skid.  If your vehicle has a manual transmission, you should also slowly depress the clutch while you ease off the accelerator. 

5A: 10 inches. 

6A: False. Let the antilock braking system (ABS) work for you. If your car was built in the current century, chances are it has ABS. If you’ve ever felt a vibration in the brake pedal on a slick road, you have witnessed ABS at work as the system prevents wheel lock-up. So, with ABS, don’t pump the brakes—that technique is from a former generation of vehicles. Instead, keep firm pressure on the brake pedal until your car comes to a complete stop.