Originally Posted by
Hoyaheel
don't want to have to pay too many extra driver fees (esp since I can't find those fees on rental company websites up front either)
They are usually displayed in the options during the booking process. Probably ~5 to 10€/additional driver & day. Additional Young drivers adds another 5-10€/young driver & day to the additional drivers fee.
Originally Posted by
Hoyaheel
..., so only one of the US drivers will have to get the IDL....
The IDP is not so much of an hassle to be honest. They can save you some time in traffic stops. I would say that they are worth their money.