These boats are economy on fuel because they:

1) Use new technology engines:
-Diesels TDI engines which are lighter and they use -30% less fuel compare to traditional diesels
-Petrol LEANBURN new 4 stroke outboards use less fuel especially on cruising speed.

2)The boat is lighter in weight (new infusion method ect) so needs less power to go on the plane and keep the cruising speed !

3)The hull design helps the boat to keep the plane on low speed with less power

4)The correct combination of boat and engine