When you are run out of booster fuel, tap on the Booster button to open the refueling service where you can buy more fuel. Moreover, all fuel types are available at the Galactic Store. Don’t forget that an activated booster will consume fuel continually, until it runs out. To disable this function, untick the Booster fuel automatic consumption option in the Settings Menu (button with a gear in the upper right corner of the game window).
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