When attempting to get 6000 distance, glide up and down to balance out speed and altitude. First dive slightly down to buildup speed, then fly a little bit up (about 2%-15% resistance) to gain altitude. When you fly upwards and gain altitude, you lose speed due to air resistance, so you must dive to gain speed. Save your rocket fuel for later on, and use some of it when you are going upwards to increase altitude. Keep repeating this cycle between diving and flying upwards to achieve minimal speed/altitude loss.
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