I agree with codprawn in that these big outboards arent really a huge leap forward in fuel economy savings over the last of the EFI 2 strokes. I just wish someone would come up with a Turbo Diesel outboard using a modern all alluminium high tech car based engine.
(Most car manufacturers are squeezing more power out of their diesels than similar sized petrol units!) Take a look at the Volvo Penta website for figures, A Volvo-Penta D12 makes 715hp burning the same 140litres an hour as that 350 Verado.! and if you take their closest hp engine to the Verado 350, probably the D6-330hp, it only uses 70 litres an hour flat out! Thats half!!!
Its a no brainer, TDCI outboards would give us instant fuel consumption savings of 30-50%.
I'm sure some of the big Outboard manufacterers are already working at it behind closed doors. Roll on