Why do outboards use so much fuel

Why do external motors consume a lot of fuel? This is a common topic of concern for ship owners. In fact, this is related to the working principle of the external motor. In an internal combustion engine, a very important concept is thermal efficiency. Thermal efficiency refers to the ability of an engine to convert energy from fuel into power. However, the internal combustion engine has only about 30% thermal efficiency, and the remaining 70% becomes exhaust gases and lost thermal energy. This is why external motors require a lot of fuel to provide power.
In addition to this, the external motor also needs to overcome the resistance of water. Imagine when you're swimming in the water and you need to work hard to move forward. This is the resistance of water. In the same way, boats encounter water resistance when traveling in water, which is a huge challenge for external motors. The motor needs to consume more fuel to overcome the resistance of the water, which keeps the boat moving at speed.
Another factor that affects the fuel consumption of an external motor is the size of the motor. The larger the motor, the more fuel it requires. This is closely related to the power of the internal combustion engine. When more power is converted into power, the motor needs more fuel to support.
Finally, the maintenance of the external motor also affects its fuel consumption. If the external motor is not regularly serviced and cleaned, dirt and build-up will cause it to become less efficient, which requires more fuel to provide the same speed.
In general, external motor fuel consumption is related to several factors, such as thermal efficiency, water resistance, motor size and maintenance. Boat owners can reduce the amount of fuel consumed by taking care and maintenance of motors, purchasing more efficient motors, etc., as well as reducing fuel consumption through reasonable driving skills, which will be good for the environment and wallets.