Minion Fuel

Minion fuels are items that can be used to speed up the production rate of Minions. These fuels can last for either a limited amount of time, or an infinite amount of time.

How to apply fuel

 * 1) Right-click the minion.
 * 2) On the left side, there will be a vertical bar with 5 slots.
 * 3) Put the fuel of choice in the top orange slot.
 * 4) Select the fuel from the hotbar and left click on the top orange slot.
 * 5) Done!

Types of fuel
A list of all the fuels in the game, including how long they last for (real-time) and how much the minion is sped up by. Special usage column indicates when the fuel affects the efficiency of the minion.
 * Remember
 * Minion action times are not decreased by the same percent as shown in table. For more information, see Minion Fuel & Effective Fuel Speed.

Calculations
Although fuels have their speeds shown in the tooltip, it is not exactly as it seems. This is because it does not directly reduce the action times by X%; it instead calculates how fast a minion needs for it to produce X% more items a second.

Fuel Efficiency
Fuel efficiency is the relationship fuel speed has on decreasing the cooldown (time between actions) of a minion. Minion Fuel speed does not have a linear impact on fuel efficiency, and instead the efficiency decreases along with the increase of the speed bonus. To calculate Fuel efficiency, use this formula:

$$FuelEfficiency = \frac{1}{1 + FuelSpeed}$$
 * Note
 * Fuel Speed should be converted from percent value to a fraction.

Example
Example calculation for Foul Flesh:
 * Information
 * $$FuelSpeed = 90%$$


 * Calculation
 * $$FuelEfficiency = \frac{1}{1 + 0.9} = \frac{1}{1.9} \approx 0.526 \approx 52.6%$$

Time Reduction
Time reduction is not exactly the amount shown in the tooltip. To calculate how much does the fuel reduces the time between actions, use this formula:

$$EffectiveSpeed = FuelSpeed \times FuelEfficiency$$

or this, the most basic formula:

$$EffectiveSpeed = \frac{FuelSpeed}{1 + FuelSpeed}$$

Example
Example calculation for Foul Flesh:
 * Information
 * $$FuelSpeed = 90%$$


 * Calculation
 * $$EffectiveSpeed = \frac{0.9}{1 + 0.9} = \frac{0.9}{1.9} \approx 0.474 \approx 47.4%$$

Minion Speed Bonus
Minion Speed Bonus can be calculated using this formula:

$$NewCooldown= Cooldown \times FuelEffectiveSpeed$$

or this, the most basic formula:

$$NewCooldown= Cooldown \times (1 - \frac{FuelSpeed}{1 + FuelSpeed})$$

Example
Example calculation for Clay Minion tier XI with Enchanted Lava Bucket:
 * Information
 * $$Cooldown = 16$$
 * $$FuelSpeed = 25%$$


 * Calculation
 * $$NewCooldown= 16 \times (1 - \frac{0.25}{1 + 0.25}) = 16 \times (1 - \frac{0.25}{1.25}) = 16 \times (1 - 0.2) = 16 \times 0.8 = 12.8$$&#32;seconds

Tips

 * Keep in mind that when a minion fuel is inside a minion, it cannot be reclaimed unless it has an infinite duration (Enchanted Lava Bucket / Solar Panel).
 * Minion fuel is stackable and will allow the player to extend the fuel time.
 * The duration shown in-game used to be in-game time before version 0.7. It is now real-time. However, the duration itself didn't change.
 * Fuel will be used even when the player is not playing.
 * If the player picks up a minion with fuel inside, the fuel will be destroyed.
 * The solar panel can be used with a Day Saver, making it just as powerful as an Enchanted Lava Bucket. However, this works only when the player's island is loaded.
 * It is a very common misconception that time between actions will be reduced by X%. X% speed means Y% reduced time of the actions themselves. For example, if it takes the minion 40 seconds to get 1 piece of coal, it will take the coal minion 8 seconds less when using an enchanted lava bucket, as the enchanted lava bucket increases production speed by 25% (in turn decreasing time between actions by 20%).
 * For new players, it might be worthy to constantly fill up their minions with Enchanted Bread as it gives them a 5% boost for just ~100 coins per day.
 * The Enchanted Lava Bucket is rather expensive fuel takes a long time to pay off. However, if the player doesn't plan to use higher tier fuels such as Hamster Wheels or Catalysts, it is usually a positive investment.