130 gal/hr ... 226 gallons of jet fuel an hour

I see one mistake in my calculation. That Piaggio Avanti has a cruising speed of 360kts vs. 0.85 mach = 547kts for the cruising speed of Gates' G650ER.

  (360 nautical miles / hour) / (130 gal / hour) = 2.76 gal / nautical mile
  (547 nautical miles / hour) / (226 gal / hour) = 2.4 gal / nautical mile

And I thought my old car was a gas guzzler at 20 statute mi/gal.