Comment by fnord77

a Cessna engine costs maybe $30,000 to overhaul (every 1800 hours or so)

a Gulstream G650 engine costs maybe $4,500,000 to overhaul every 10,000 hours. Times 2.

a Cessna 172 sips about 8 gallons per hour.

A G650 guzzles about 500 gallons of fuel per hour

jet fuel is a little cheaper than avgas though