I spoke to Jon at Stephan's, and the van's timing was out by about 4 degrees. That would be the cause of the poor fuel economy, but it's strange that I didn't feel anything. They're going to put in new plugs, as they don't rate the Autolites I put in when it failed the emissions test. They're still trying to find a leak in the AC, but it's working fine at the moment. Hopefully I can pick it up on Thursday or Friday.
In the evening we concluded our "Spaced" marathon. It's been fun trying to catch as many pop culture references as possible :o)