Labbed, 500hp, 83 with six people and 3/4 fuel.

What are you running? Mine was born with 415hp/ 502's and bravo drives. Previous owner bumped the engines (dynoed at 497) and swapped drives with XR's.

I also have labbed 30's that I run. playing with the setup. For some reason the xr's have a 1/2" spacer that I had removed once, ran a poker run with 5 people. No change in getting out of the hole, the boat ran flatter but 3 mph less. But the rooster it shot was unbelievable. that was with the 32's. Never got to try the 30's like this because the mechanic misunderstood my directions and put the spacers back in. I want to try spinning the props in with and without the spacers.

mine are making 550 hp i run 30s at 5500 87-90 mph depending on the load the boat when i first got it with stock 500hps went 85-86 on gps what rpms you running with the 32s.
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[QUOTE=rssteiny;3969792]mine are making 550 hp i run 30s at 5500 87-90 mph depending on the load the boat when i first got it with stock 500hps went 85-86 on gps what rpms you running with the 32s.
.[/QUOT

Right at 5000. Your speeds are good to know, hoping to add the Ateco kits to mine this winter, was hoping to see 90's

Actually those numbers are very close. Your numbers are way off, unless you have a 740 gallon tank.

A 500EFI burns about 23 gph at 4000 rpm. 23 x 2 engines = 46 x 4 hours = 184 gallons.

...Well then I guess I must've been towed in and don't recall, since I only hold 142 gallons. Thanks for the equation Einstein, but it doesn't work for my boat.

I wasn't trying to be a dik, but math doesn't lie. Do you realize that the numbers you posted equal 7.8 mpg and your boat goes 1120 miles at 70 mph? Now, that is

x2

70 mph X 4 hours=280 miles covered. 1/4 of 142= 35 gallons, 280 miles divided by 35 gallons= 8 miles per gallon OR 4 hours of cruising with a total use of 35 gallons would be 8.75 gallons per hour for BOTH motors or 4.375 gallons per hour per motor to cruise at 70 mph,
So that would mean your boat cruises at 70 mph while using 4.375 gallons per hour for each motor, 1136 miles on 1 tank of gas!!!! You could drive from tip florida to Virginia on 1 tank of gas, you have a unique boat, Smitty

To OP, my Baja with stock 502mpi got between 1.8 to 3.2 mpg depending on cruise speed, babying it at 3000-3200 it would go about 150-180 gps miles on 90 gallon tank and use about 70-80 gallons to fill, (about 3.5-5 hours of run time when not running it hard on small water cruising) fwiw, Smitty