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

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