Something is weird with Oxygen and the Heavy Rover. I'd noticed things before but decided to do a test. I had a tank of oxygen on the back of the rover to use as a constant source of oxygen. I've got the "pull oxygen from environment tech." The tank started at 2379L. My test was to close the door on a 100% full rover oxygen tank and then stay in the rover without opening any doors until we hit 86%. I kept my helmet on both times. I did this twice in a row. And recorded the times between percentages and amount of oxygen from the tank removed. The total time was roughly 13min 50 second for each attempt. Each percent after the first percentage of getting inside and closing the door and the oxygen spent refilling the cab was roughly 1min 12 seconds. This was pretty consistent across both tests. After the first test and refill from the tank, the tank was at 2297. A loss of 82L. The second test and refill took the same 13:50(roughly. Phone stop watch and human reflexes allow for degrees of error). The second refill ended at 2215L. Also a loss of 82L. I then went outside in just my suit and spent the same 13:50 waiting. This dropped the oxygen gauge a little and then I refilled my suit directly from the tank. This dropped the tank to 2214L. So, the rover and pulling oxygen from the environment is dreadfully inefficient compared to just refilling the suit or individual bottles from a larger tank.
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