The counter agent aggressively pushed the most expensive fuel option, he then pushed harder on the insurance and nearly refused to let me decline their outrageously prices and completely needless insurance, and then he explained the big surprise: Dollar charges a PENALTY for both early and late return. I travel almost every week and none of the other majors do that (though the agent lied to me about that). For everyone else, you pay for what you use unless you've rented a special package like a weekly rate and then return in, say, 4 days. For Dollar if you reserve a car for the standard, rack daily rate for 5 days (my case) and bring it back in 4 you pay for nearly 5 days (4 days plus penalty) and if you keep it for 6 you pay for nearly 7 days!!
That they penalize us for wanting to rent more time is a terrible policy. That the agent LIES to me means I'll never do business with them again. Two weeks earlier their agent in Salt Lake City lied about something else, so it certainly seems like corporate policy.