Thanks all,
W'ere taxed to death.....and beyond, no matter what!!
I'm flying a really great plane, hiring dry and working out the best solutions versus fuel burn is a whole new ball game. I'm still working out the sums of increased burn up to Fl 12,0 and the savings on the descent versus staying lower and not burning so much in the climb. Sustaining 200 kts in the descent is really great though
I'll keep doing the sums!