Well when gas prices went up in 2008 Geo Metros were all the rage for a hot minute:
Gas prices drive Geos from clunkers to chic - CNN.com
It's a 12-year-old oft-mocked clunker of an automobile.
I also remember plenty of news stories at the time about increased demand for fuel efficient vehicles at dealers and people trying to unload their Humvees. But yeah, we’d need sustained high prices to make a lasting impact on behavior.