<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Beckles:
I'd have to think that lying to Avis about your country of residence is a violation of the Rental Agreement</font>
I didn't lie. I just left the field at its default.

Their "help" screen says "Please select the country in which you are currently living." Rather loose for a legal definition, I suspect. (I'm living and I'm currently doing so in the USA.)
Despite those rather dodgy interpretations, I suspect they lose much hope of saying I'm violating the rental agreement when they accept my Australian drivers licence and Australian phone number in the process of generating the rental agreement.
If they had objected at that point, I was travelling with a US resident in each case, so we could have switched the rental to her name.