In boat/yacht magazines, they refer to gph (gallons per hour). Does that mean for each engine or both engines

Question

In boat/yacht magazines, they refer to gph (gallons per hour). Does that mean for each engine or both engines

Answer 1

total amount used

Answer 2

Usually means TOTAL consuption at given speeds ( to go 20 mph,would take the same fuel whether 1 engine or 2 or 3)

Quick rule of thumb

Total HP divided by 15 usually equals Total GPH at FULL throttle(350 hp / 15 = 23 gph)

REMEMBER 1/3 of the fuel to get there

1/3 to get back and 1/3 for safety sake