General Advice on Hiring a Car
When you purchase car hire you are entering into a contract with your car hire company. Always check their terms and conditions before you buy to make sure you're aware of your responsibilities when you collect your car in United States, and any additional charges.
Here's a few things to watch out for: Almost all car hire companies add a mandatory fee for drivers under the age of 25. Check what level of insurance is included for the hire car in United States. In particular check how much the excess is (the amount you need to pay in the event of any accident) you may want to take out additional insurance. Check what the fuel policy is with your car. Don't forget to fill up the tank before you drop it off if you've agreed to return it full! Find out if there's a maximum daily mileage - especially if you're planning to do a lot of driving in United States! You'll need to pay a deposit (or pre-approve one) to pick up the car. Most car rental companies will only accept credit cards for this.
If you'd like more advice on common charges (and what you can do to avoid them) read our complete guide to car hire.