Taking on the one way car reservation

I pick up a car earlier this week for a one way rental from one city in Ohio and dropping off in another and made my decision in part based on the estimated total charge of $178. So you can imagine I'm flabbergasted When I return the car earlier today I am told my total charge will be $318. I question it and am told that they are charging me $0.45 mile for the 250 miles I drove
Now nowhere in my reservation was it clearly stated that there was any kind of drop off fee and no time before have I been charged a mileage penalty
I explain to the guy that I booked this reservation specifically because of the estimated charges and that nowhere did it give me a number that resembled anything close to $300. He counters with the thought that Budget would not know how many miles I would drive which countered with the fact that they knew where I was picking it up and since they knew I would at minimum drive to the other airport they could have at least estimated that the most direct route from airport to airport was still 175 miles.
I get charging extra for the 75 'extra' miles but basic laws of physics tell you that it could not have been done in zero miles