Multiple cars on this list suffer from a similar problem: problems with fuel storage. The Horsey Horseless was an early example of why this is a problem, and the Morgan Plus 8 Propane is a much more recent example. The Morgan Plus 8 almost never made it into the American car market.

Originally designed overseas, it could not pass updated emissions standards. However, a dealer from San Francisco came up with the idea to switch to propane. He mounted a large propane tank on the rear bumper, making this car exceedingly dangerous to drive. Plus, it was heavily outdated since the design had changed little in decades.