Aero News has a story today about Indus Aviation flying a diesel
Thorpedo burning only three gallons of Jet-A per hour. It uses a
WAM-120 turbocharged three-cylinder diesel engine generating 120
horsepower. One drawback of the engine - the installed weight is 279
pounds. But on the plus side it uses a mechanical control unit rather
than electronic. The "projected" TBO is 3000 hours.

Phil