The Lockheed TriStar with positively the most advanced flight management system (for its time) offered two distinct drift-down speeds in the event of an engine shutdown.
A slower speed with high thrust set on the remaning engines to minimise height loss where terrain was important, and a faster speed with two-engine cruise thrust to obtain more favorable nautical air miles per unit of fuel used.
Either selected at the touch of three buttons.
Oddly enough, both the TriStar and the B707 offered very similar engine out speeds/increased fuel consumption...approximately 430 KTAS and an increase of 500kg/hr.
Not too shaby for old iron.
