Originally Posted by
gearlever
Fuel burn 737-800, LRC
Compared to 2 Engine LRC at Optimum Altitude how much more is it with one eng?
Thx
Fuel burn depends on the DD (drift down) altitude capability provided by the FMC, if the crew had executed the EO (engine out) prompt on the FMC CRZ page.
DD provides best L over D in the descent but once established at the new FMC CRZ altitude, 300 knots or LRC can be set/selected.
QRH (engine failure etc) then directs the crew to land at nearest suitable. If fuel contamination was/could be part of the original problem, then the extended time in flight wasn't a good idea.