1. Know how far your car can go on a tank of gas. It sounds really dumb and simple but I am amazed at how many people simply don't know.

This is very useful if you have to leave an area because of an impending (insert disaster here). If you know you can go 400 miles on a full tank, and you need to go RIGHT NOW but only have 3/4 a tank, then you know you can go 300 miles and can plan accordingly. It also allows you to accurately compute your MPG.

2. A follow up is keep your vehicle topped off at all times, or as much as is practical (try for at least when it gets half empty). Trying to evacuate and getting in your car to find a low fuel light on would be a bad experience. Also, gas might not be available or priced too high, or lines may be hours long, or rationed out.

3. If your car does not have a locking gas door, buy a locking gas cap. It prevents people from siphoning or putting crap in your tank.

4. Try and keep a 5 gallon container in your garage. Every month pour it into your tank and replace the gas to keep it fresh. If you did #1, you know how far those 5 gallons will get you if you need them.

5. Keep a bottle of coolant, oil, washer fluid, etc with your gas in the garage.