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Fuel consumption difference between JT9D-7 and PW4062

Posted: Sat Aug 12, 2017 4:57 am
by SCAT15F
Wondering if anyone knows the fuel consumption difference between the baseline JT9D-7 and the current PW4062

I'm thinking somewhere between 10-12%?

Curious as to what kind of range improvement that would (hypothetically) translate into for the 747SP (all other things being equal)