Hopefully none. If your engine is burning oil, especially in the gallons/hour range, your motor needs to be replaced.
Do you mean gasoline? If so, that's not enough information. HP is simply the amount of power that a motor can produce. You can have 2 engines side by side, one that burns say 10 gallons of fuel per hour, the other which burns 20 gallons of fuel per hour, but both of which generate 40 HP. The fuel efficiency of an engine does not directly influence the HP generated by that engine.
To calculate the amperage of a motor more information needs to be stated. The voltage, wattage or horsepower are needed and then use this equation I = W/E. Amps = Watts/Volts. For calculation purposes there are 746 watts in one Horsepower.
190 horsepower
About 171.6 gallons per hour.
250 to 300 horsepower
it takes about 3.7 gallons per hour.
About 50,000 to 65,000 Gallons
50 gallons of water per minute equals 3,000 gallons per hour.
746 watts = 1 horsepower 1,000 watts = 1.3405 horsepower (rounded) 1 kilowatt-hour = 1.3405 horsepower-hour (rounded)
2 gallons per hour
225 horsepower
A 5 HP motor consumes approximately 3.73 kilowatts (kW) of power, as 1 horsepower is equivalent to about 0.746 kW. To find the energy consumption in one hour, you multiply the power by the time: 3.73 kW × 1 hour = 3.73 kilowatt-hours (kWh). Therefore, a 5 HP motor consumes about 3.73 kWh of energy in one hour of operation.
Depends on the voltage. If you are running off 120 VAC, a 0.5 horsepower motor would draw 3.1 A.