Please post your boat Make/Model/Length and Power, and how much fuel you consume at cruising speeds/top speeds and what those speeds are?

Thanks

Sonic 31ss twin 454s average 1.5 mpg

35 Cafe Racer, Slightly warmed over 502's, about 450 hp per side. At Cruise, I'm consuming 14.9 gallons per hour per side at 3500 rpms which is exactly 50 mph. So, I guess that makes it 1.67 mpg at cruise. I never took readings at WOT; I really don't want to know.

Don't want to know !

?? Is this a mis-print?

43 Black Thunder 500 efi's, XR's at cruise 3500 rpm 1 mpg

Nope. Turn-key and go!!
I've learned my lesson. Nothing beats reliability. I do damn near 200 hours a year. I want to boat, not wrench.

What uses more fuel... A built SINGLE IO or A pair of mild bbc?

2.2 mpg with a labbed 28" Bravo 1. Just got a labbed 29" Cutting Edge prop so I'll see if the mpg goes up. Hopefully the top speed will increase. I will be doing some charting on both props to see how they compare.

.5 miles per gal 110.