I see a lot of discussion on here about worrying about additional driver fees. I found this on Avis' website and thought it might be helpful for some of you - you may want to check the policy at the car rental company you are using to see if it's the same:
Additional Drivers
The following individuals, if 25 years of age or older and in possession of a valid drivers license, may drive the car with the renters prior permission:
Renters employer (while on company business);
Renters fellow employee (while on company business);
Renters spouse or life partner.
The above additional drivers are considered authorized drivers and need not be present at the time of rental nor do they need to sign an additional driver form.
Other individuals may be listed as additional drivers, provided they are at least 25 years of age; present a valid drivers license; present an Avis-honored charge card; and complete an additional driver form. An additional driver fee may apply for each additional driver (see Additional Driver Fees for details and exceptions).
Additional Drivers
The following individuals, if 25 years of age or older and in possession of a valid drivers license, may drive the car with the renters prior permission:
Renters employer (while on company business);
Renters fellow employee (while on company business);
Renters spouse or life partner.
The above additional drivers are considered authorized drivers and need not be present at the time of rental nor do they need to sign an additional driver form.
Other individuals may be listed as additional drivers, provided they are at least 25 years of age; present a valid drivers license; present an Avis-honored charge card; and complete an additional driver form. An additional driver fee may apply for each additional driver (see Additional Driver Fees for details and exceptions).