Well..Diners Club just faxed me their extensive rules for automobile coverage. They exclude: "Any single rental/contract of more than 45 days AND any back-to-back rental of more than 45 consecutive days (a back-to-back rental is two or more rentals of the same vehicle or different vehicle within the same geographic market, with the 1st ending, and the 2nd beginning within a 24 hour period". It appears that DC has it pretty well down pat what they will and will not cover. I guess I don't blame them at all.