If you prepay for a full tank of gas and return the car as close to empty as you can, they do not ch

If you prepay for a full tank of gas and return the car as close to empty as you can, they do not charge you triple pump price, they charge you the going rate. They only jack up the price if you fail to return it full when you contracted to do so. I have prepaid for a full tank for years now, I don't know why anyone would bother with the return-it-full gig, sorry!
Newbe--the reason not to prepay (in my single experience) is the conflict between trying to drop the car with about half a gallon of gas versus running out of gas on the way to the drop off. Since then, we've always filled it up before dropping it off. But of course there is never a station cheap student airline tickets right next to the dropoff cheap student airline tickets so if the rental companies are going to play this game, we're going to lose. Loved the quote "This is going to be good for customers."
Half a gallon of gas costs less than $2.00; I am OK with losing the cost of a whole gallon if it means not having to seek out a gas station right by the airport, where prices are usually higher anyway. Modern cars tell you how far you can go before you run out. It's just not that risky!
Recently rented a truck from Budget that had to be returned full. Stopped at station less than two blocks from the rental return, filled cheap student airline tickets it until the handle repeated turned off, had the receipt, but was still charge a refill fee because the truck fuel tank had a long neck and they could not see any gas in the neck. So they took a watering can of gasoline and poured it down the filler neck until it ran over. That is what they meant by full. I give them the extra ten dollars and decided it just went into someone's pocket.