This link has the details, but I'll summarize.
For those considering power options for the 400 Super Sport,
these are revealing statistics at WOT.
2 x 370-hp Volvo Penta D6 Diesels use 40.6 gph.
2 x 525-hp Mercury Racing EFI Bravo III XR use 85.9 gph.
The Bravos are faster, but some might go with the Volvos because of
their fuel-sipping quality.
111% fuel savings! That's pretty darn impressive.

http://www.boattest.com/Resources/vi...px?NewsID=2929

--Vic