I wouldn't quarrel with the 14 gal/hr at the reduced 125 kt speed and assuming lean-of-peak operation (which requires matched injectors such as GAMI, cylinder-by-cylinder engine monitoring and a knowledgeable pilot). And "stratobee" has put the margin in the additional 2 - 3 hrs that he's budgeting.
I wouldn't do it myself, but the numbers look OK.
Ernie
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