How do you calculate fuel consumption from horsepower?
Robert Bradley
Published Mar 22, 2026
How do you calculate fuel consumption from horsepower?
Expressed as a formula it looks like this:
- Given Horsepower x .50 lb fuel/hp = lbs of fuel for given horsepower.
- 200 lbs/hr / 6.25 lbs/gal = 32 gph.
- BSFC . 50 / 6.25 = . 0800 gallons / horsepower / hour.
- OR.
- BSFC .70 / 6.59 = .106 gallons / horsepower / hour.
- 800 * .106 = 84.80 gph.
Does horsepower affect fuel consumption?
Horsepower is a major factor in a vehicle’s fuel consumption. More power generally means higher fuel consumption. This means you can save money on fuel, and reduce your impact on the environment, by choosing a vehicle with no more horsepower than you need.
What is the formula to calculate fuel consumption?
The following formula is used to calculate fuel consumption in litres / 100kms, the most commonly used measure of fuel consumption. (Litres used X 100) ÷ km travelled = Litres per 100km.
How much fuel does a 200hp outboard use?
| Select Yamaha Outboard Test Model | Stroke | Fuel consumption WOT |
|---|---|---|
| Yamaha 200 HP VMAX V6 | 4 stroke | 19.2 GPH |
| Yamaha 225 HP V6 | 4 stroke | 17.7 GPH |
| Yamaha 250 HP V6 | 4 stroke | 23.8 GPH |
| Yamaha 300 HP V6 | 4 stroke | 26.0 GPH |
How much fuel does a 600hp use?
Making the Choice
| Fuel Pump Free Flow | Carbureted Engine | Fuel Injected Engine |
|---|---|---|
| 50 gph/190 lph | 600 hp | 500 hp |
| 67 gph/255 lph | 750 hp | 650 hp |
| 90 gph/340 lph | 1000 hp | 850 hp |
| 125 gph/470 lph | 1300 hp | 1000 hp |
Does more horsepower consume more fuel?
Generally speaking, the bigger the displacement, the more volume of air and fuel a piston can move during the combustion process. This customarily means more horsepower and torque. Too much displacement usually means the engine will likely be wasting fuel, since it has to satisfy volumetric flow requirements.
How HP affects speed?
Acceleration time and speed are closely related to horsepower. In general the more horsepower a car has the higher its top speed is, and the faster it can accelerate to 60 mph. Additionally, horsepower affects a vehicle’s towing capacity, which is obviously especially important for trucks.
What is good fuel consumption?
Anything that is listed as less than 6-litres/100km or more than 16.5km/1-litre is considered to be pretty good. The first (and most common) reference is litres per 100km (litres/100km). In this instance, the higher the number of kilometres travelled the more fuel-efficient.
Why are boat engines so inefficient?
Why do boats burn so much gas? The main reason why boats will always burn more gas than cars is they run on water. Aerodynamics, wind resistance, waves, and drag affect the fuel consumption of a boat. Basically, a boat needs to use more fuel to cover the same distance a car will cover.
How much fuel does a 90 hp outboard use?
The answer to this four-year-old inquiry (begun in 2002) is that a conventional two-stroke will burn about about one-tenth of its rated horsepower in gallons-per-hour at full throttle, or a 90-HP will burn about 9-gallons-per-hour, and so on.
How can we reduce fuel consumption?
8 Ways to Reduce Fuel Consumption One of the best ways to reduce your fuel consumption is to purchase and drive a vehicle that is projected to get great gas mileage. Reduce the amount of time you spend on the road. Reconsider how you purchase your fuel. Change the way you drive. Streamline your vehicle. Keep up with general maintenance.
How do you calculate fuel consumption?
Fuel consumption figures for excavators are usually expressed as gallons per hour. To calculate the fuel consumption, simply divide the number of gallons of diesel required to fill the excavator’s fuel tank by the number of hours that the machine has worked.
Does premium gas increase horsepower?
Premium, also known as 93 octane gasoline, is the most expensive gasoline at the pump. Premium gasoline does and does not give more horsepower, depending on the type of automotive engine it is used in.
Does ethanol reduce horsepower?
No use of ethanol will not by definition reduce horsepower, but you will need to burn more of it to get the same horsepower. On an closed-loop FI engine the computer will handle this for you.
