They only give you 6 gallons. Also when you return it at drop-off you should have no more than 6 gallons in the tank otherwise they can't ship it.
So if they gave you a full tank, they would be forcing you to take a road trip, whereas some people don't drive the car at all or just drive it to drop-off.
During my ED, I estimated how much gas I would use on my route, and only added that amount to avoid overfilling.
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