Actually there is considerable evidence that Casey was attempting to get gas for the car. She asked JG to bring a gas can with some gas, but he was busy, so she got AH to buy a gas can for her, Casey just never got the gas and got back to the car before it was towed.
Before I found out the above, I honestly thought Casey was probably setting her car up to be towed to make it look like a homicide and then she would skip town and Caylee would be found in the trunk of the car dead and everyone would think Casey was kidnapped and murdered, too. But the fact that three people knew that Casey ran out of gas and that her car was at the Amscot because she told all of them and attempted to get gas disproves that theory. The other proof against the skipping town scenario is that she had $1200 of AH's money and access to her car for a week, but she didn't skip town in that car. And later she had access to TL's car for a week, but again, she didn't skip town. If she had skipped town, I would have thought consciousness of guilt, but she didn't do that.
And another thing, as an adult, Casey could have refused to go with Cindy. She could have stayed at TL's apartment and after Cindy had gone, she could have fled. But she didn't do that. Very odd, IMO.