Does anyone know what the GPH numbers are for the 570, 625, 650 and 725? Not only interested in the 100% load number, but also the 50% load and 75% load number, if possible.

I thought that I saw them published somewhere, but I can't find them.

My 725 delivers 3.0 mpg at 4000 rpm/60 mph in a 4,000 pound boat. That's 20 gph at slightly less than 50% throttle.

Yeah, so did I. Thank you.

Just spoke with Ian Hawkins. Figure 50 gph at wide open for a 725 Ilmor. (70 gph for a Mercury 700SCi.... )

Would it be correct to assume that the 100% and 50% fuel consumption would be as follows?

570: 40 gph @ 100% and 15 gph @ 50%
625: 43 gph @ 100% and 17 gph @ 50%
650: 45 gph @ 100% and 18 gph @ 50%

I would assume that fuel burn would be roughly proportional to horsepower, since they're all essentially the same configuration.

So do I. I've calculated the 725 gph to be 14.5 hp pr. gph, and came up with these numbers.