What is the general price of car rentals?

I have never rented a car before, so I need help to figure out if the price is affordable. I currently live in California, and I'm 19 years old. We're looking for the cheapest car option. We are going to be using the car for 3 days straight. Approximately how much would it cost for the cheapest car rental?... show more I have never rented a car before, so I need help to figure out if the price is affordable. I currently live in California, and I'm 19 years old. We're looking for the cheapest car option. We are going to be using the car for 3 days straight.

Approximately how much would it cost for the cheapest car rental? Also, how does the gas mileage factor in?
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