I kept working on Whip It! and managed to get her started. She ran down towards Amboy for a while, then stopped again. Now I know either I'm dealing with a fuel leak or else something is very wrong. Soon Daniel & Ponyboy showed up. I asked what was up, & they said whatever the plan was, we wouldn't be returning to Amboy any time soon. Turns out The Grouch came out with a pistol stuck in his waistband, refusing to return the deposit. He had probably figured he'd sold a ten-dollar gas can for fifty bucks. They finally managed to get the money and we finally put Amboy in the rear-view mirror.
Update (30aug2002): Online evidence that we're not alone in our experience of anti-friendliness at Amboy Roy's on Route 66.