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Well, Mr. PDX, I tell you what we can do...you go buy you a 1989 Whaler 27 FC and weigh it. After you recover from the shock of what you will find it to ACTUALLY weigh, go to the trouble of getting it to your home port, and get it registered in your name, post some pics of it on your personal page. I have a set of 200 HP Yamaha's I will then sell to you at a small profit to me. Feel free to prop your boat any way you desire. After you get all this done, post a new thread on 1989 Whaler 27 fuel efficiency vs. power in whatever forum you desire.
Oh, you could opt for the Mercury Verado's that you mention if you prefer, I have plenty of folks who are offering me plenty for the Yammies locally. It really doesn't matter to me.

Remember, there is a big difference between the Mercury Verado's and the Yamaha Offshore 4.2 L's, these are not the same engines.

The 1989 Whaler 27 FC is rated from the factory for 400 hp min and 600 hp max. I have chosen max HP on MY boat, You can put any amount you want on yours. After you get one, of course.

At that point in time I will make a decision on whether I would like to argue with you, or even go into further detail regarding my decision with you. Rest assured, I did my homework before deciding to repower with the 300 yamahas, and if a .04mpg difference in fuel economy between any 2 engines had actually been a factor in my decision to go with the 300's, I would not have been able to afford to own or operate this boat anyway.

I may be a moron in your opinion sir, but I can assure you, after reading your post I feel much better about my decision to repower with modern 4-stroke Yamaha 300 twins.