I don’t see how not buying gas on a specific day would do anything. We’d still have to buy it the next day…
And Venezuela does ship some oil here. Citgo! And I heard a story way back that they were providing some poor American households with really cheap natural gas as a publicity stunt. Don’t know if they’re still doing it, but it was to make themselves look better than our administration.
Edit: found it http://www.npr.org/templates/story/story.php?storyId=5065068