Regular cubane and related compounds have been investigated as race fuels. The bond angles means that extra energy is stored (basically via tension in the bond

Regular cubane and related compounds have been investigated as race fuels. The bond angles means that extra energy is stored (basically via tension in the bonds due to those extreme angles) compared to 4 ethane molecules (which add up to the same number of carbon atoms, hydrogen atoms, and bonds as one cubane molecule). So your race car could weigh less while still having just as much fuel energy. I think most race series have standardized fuel across competitors now so it’s unlikely anyone will continue with the research.