fassy, thanks! My own experience with SIXT just contributed to my confusion. I had lots of troubles with crediting points for SIXT rentals until an agent at GOT explained me in what format I should fill in my number (EBXXXXX).
Hopefully my rate will be qualifying. Basically I only use AWD from the back of my card, no PC, no RC. It's curious pricing btw. If I just book at avis.com with AWD number it offers me 197 EUR normal rate (Pay later) which should bring 3500 EB points. If I book via avisworld/eurobonus (should earn 4000 EB points) then I'm offered:
185 EUR Pay Now rate
205 EUR Pay Later rate
I'm pretty much set up so I would go for Pay Now rate, just wanted to be sure about points credit (SIXT doesn't allow mileage accrual on prepaid rates e.g.).