I gave a guy money for gas after listening to a sob story and saw him doing the same thing in the same parking lot about a week later to another person. I mentioned it to the person he was conning and left.
I'm a young female, and last week I asked people for a dime for the bus. Alot felt bad for me and gave me a dollar instead. I think people don't feel sorry for a man, but only for young girls and eldery women begging for change. But I have ran across many who went without gas, including myself, and were looking desperately for money for gas. It's all up to you, but just know it could be in you in their shoes!