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Or let me slightly adjust my recommendation... Cut the tank at the red line to begin and gain visual line-of-sight with the things you want to keep. Then alter the vertical cut into a downward slope cut where at the top still matches the red line, but the slice angles towards the center of the tank and meets up with the peak of driveshaft mountain. This should be able to keep all the objects in the tank, and also make sure to not leave a pocket for fuel to get trapped, all while maintaining maximum capacity without sacrificing much surge protection. Obviously the overall smaller you make it, the better it will reduce starvation, but there is a balance to juggle there as you probably dont want terrible range/capacity.

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