37 rental cars - 2 days - 185,000 miles

This was going to be either a genius move or a miserable failure. Either way, I figured I’d at least end up with a good story. Back in June, Avis had a promotion offering 5000 EuroBonus miles per rental. What made this offer so special was that the terms and conditions clearly specified that it was valid for rentals of any length. Too good to be true?