Originally Posted by EELightning

Good point. 200 with 50 pax (and associated ballast), fuel for 600nm @ M.72 FL330 2400 pph.
700 with 70 pax, fuel for 600nm @ M.78 FL370 3400pph.
Remove 20 pax and 20 seats and 1 FA. Add a couple closets, coke machine, upgrade 4 seats. Probably = 5000 lbs lower cruise weight, fuel burn drops to 3300 pph. Climb to F390 save another 100pph.