Originally Posted by globetrekker84
Here's a little bit of reading that you might find enlightening:
23 July 1983; Air Canada 767; near Gimli, Manitoba: The aircraft ran out of fuel ...
19 August 1983; United Air Lines 767-200; near Denver, CO: Fuel contamination ...
31 March 1986; United Air Lines 767-200; San Francisco, CA: The engines were inadvertently deactivated...
30 June 1987; Delta Air Lines 767-200; Los Angeles, CA: The engines were inadvertently shut off ...
23 November 1996; Ethiopian Airlines 767-200ER; ... dual engine shutdown due to fuel exhaustion. ...
Originally Posted by alanh
Anyway, I don't know of any all engines out failure on a twin that would have been helped by an extra engine or two.
The only one of those incidents that might have been helped was the first one you listed. However, the glitches in the avionics seem to indicate a common-mode failure that might have affected all the engines on a quad. Also, it was still within 60 minutes of an airport so it wasn't really in the ETOPS realm.