Hi Peter,

Although the Propjet obviously burns more fuel than a piston, your estimates are a bit high. I fully agree that I would prefer more than 125 gallons. 

However, 50 gallons for the first hour is high. My Propjet does burn 50+ gph on takeoff and at low altitude. However at 10-15 minutes to climb to cruise altitude with fuel burn at FL220-260 being 29-33 gph, range is somewhat more than you would expect. On descent near flight idle fuel burn can get down into the low 20's. 

As an example, I have flown nonstop from Key West to Huntington, WV with a headwind in 3:30 using all of my 112 gallons in the wings but still leaving me  34 gallons in my belly tank.  This averages out to 32 gph. 

On multiple flights I have estimated that I have right around 4:30 of flight time until dry starting with full fuel ( though I generally use my belly tank as my full hour of reserves and never get close to dry).  I have 146 usable gallons. Thus with 125 gallons one would estimate approximately 3 hours flight time plus legal Ifr reserves. 

I know nothing about the plane listed in your post but range would not be as bad as you suggest though I agree long range tanks are very desirable in a turbine. 

And yes you can climb at 4000 fpm(and descend at that too), cruise around 300 ktas and be airborne or stop once wheels down in 1000' feet.  No shock cooling. And boy does Jet A smell good, and the sound, and the cool factor!!!!

Wow what a plane!

Fly Safe,

David Weinsweig

N750DW Propjet 303 hours