Gas is one of those chaotic comedies where fifteen or twenty characters start out with their own little stories, and by the end, they've all slammed together around a main plot. This has about eight distinct narrative streams, which range from immediately forgettable to concentrated anti-humor.
Let's focus on the positives. For the time, there's an ok idea here. It's just staggeringly mishandled. And I did like the weird little world it created, where a DJ flies around and runs a radio station from inside a helicopter. That's what Donald Sutherland does throughout the entire movie, and it's just a fascinatingly bad idea. Especially during a fuel crisis.
And this does have a pretty good soundtrack. It's mostly rock hits from around that time, which all but guarantees it'll never see any sort of modern release. And that's probably ok. Generally, I don't love the idea of anything being lost to history, but for Gas, I wouldn't lose much sleep.