Ya I've noticed some of the same things as well. As far as using gas more quickly as the tank empties goes, it's possible that the gradations are not as accurate as the tank becomes more full. For example I know even though the gauge is on full I can still pump a few extra gallons into the tank.
When returning rental cars I always monitor the gauges rather than just filling up and I almost never actually return the car w a full tank of gas even though it shows as full.
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