Max diff on the 747-400 is 9.4 psi!

Well in my Gulfstream G550, my cruise altitude is 48,000 feet at Mach 0.80 so there can't be an big difference :ok:

If you are cruising at FL480, you are either FL470B490 or don't know that RVSM ends at FL410. In the GLEX, 10.25 psid, gives a cabin at 4,500 when cruising at FL 450.

GF

How about 88,000 # of fuel on a 8 hour flight at Mach .85 starting out at FL380 then 400.

Was that the Seattle/Farnoborough flight for the demo787?
Curious, what was TOW?

BOE5
 

Some interesting Altitude and indicated Groundspeed numbers in this flight to Peurto Rico


FlightAware > Track Log > BOE5 > 25-Jan-2011 > KABQ-TJBQ

It's really pointless to compare the 767 with the 787 - we surely hope that it's better. Why not comparing it to an A330, which is the direct opponent on the market? I guess if it's 20% to the 76 then it would be about 10% to an 33, so not much...