and the A330 family are already a lot more efficient than Boeing 767's.
This is probably another urban myth about the A330.
The 767-400, which has about the same pax capacity as the A330-200, is much lighter (OEW 103T versus 120T for the A332).
One would therefore expect the 767-400 to be more fuel efficient.
I just checked the Eurocontrol database which confirm what I tought:
fuel burn at FL350
150T A332 at 473kts: 86.2 kg/min
190T A332 at 473kts: 96.5 kg/min
124T 764 at 461kts: 70.6 kg/min
159T 764 at 461kts: 84.2 kg/min
At similar mass level, the 764 is slightly more efficient than the A332 (84.2 vs 86.2 kg/min)
However, the 764 fly at lower mass level due to its lower OEW, and is therefore substantially more fuel efficient per passenger carried than the A332
http://www.boeing.com/commercial/767...ron/index.html