To come in contact with tear gas in your dream, suggests that you are feeling suffocated and smothered by some relationship. You need to cleanse yourself and get rid of past pain,

To smell or see gas in your dream, indicates that your need to be reenergized.

To dream that you run out of gas, suggests that you are wearing yourself out. Take a time out.

To dream that you are at the gas station, indicates a need to reenergize and revitalize yourself. It may also suggest that to help and be an assistant to others.