The company making diesel engines was Thielert, which eventually went out of business. Most notably, they were available in the Diamond DA-42. IIRC, they cons

The company making diesel engines was Thielert, which eventually went out of business. Most notably, they were available in the Diamond DA-42. IIRC, they consumed 7GPH each at cruise, which is roughly half the consumption of Draco at the same speed. They were bought by a company in China and are now being marketed in the US by Continental. There are STCs for many Cessnas, which seems like a pretty appealing option. http://www.continentalmotors.aero/diesel/diesel-engines.aspx http://www.continentalmotors.aero/diesel/diesel-engines.aspx