Hello,
Chez
Avis, le partenaire (mari/femme) est d'office second conducteur gratuit, peu importe l'état de départ !
Cf Avis.com -> Customer Service -> FAQs -> USA -> Reservations -> Rental Policies, Terms and Conditions
With Avis (and Budget and Enterprise) :
The following individuals, if 25 years of age or older and in possession of a valid driver's license, may drive the car with the renter's prior permission and are exempt from Additional Driver fees:
•Renter's employer (while on company business);
•Renter's fellow employee (while on company business
•Renter's spouse or life partner.
•Disabled renters who have completed the non-licensed renter form
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.
Si on n'entre pas dans ce cas là (ie on part entre potes, entre frères et soeurs, entre pas mariés

), chez Avis :
For all U.S. states other than CA, NV and NY, the charge for additional drivers is $13 per day per additional driver, with a maximum charge of $65 per rental per driver. The additional driver fee in New York is $3 per day per additional driver. The additional driver fee in Nevada is $11 per day per additional driver, with a maximum charge of $65.
There is no additional driver fee in California.
@+
Vnoa
PS/ déjà testé Avis plusieurs fois, notamment au départ de Phoenix, Az et effectivement je ne paye pas en tant qu'épouse et on me demande juste mon permis de conduire (et encore je ne suis même pas sûre !)