DO NOT BOOK CAR RENTALS WITH WISECARS. After a recent trip to CO, I'm still trying to understand this scammy business. I booked a rental with Wisecars and received TWO EMAILS that say this: "amount due now - 198.38. Amount due at pick-up $95.14" Total $293.52." Then (OF COURSE) at Thrifty Rental Cars at Denver Airport, we receive a rental agreement that says "Total estimated charges: $365.80." And then after our trip, we received an "updated receipt" that says: "Total amount due: $312.84" for a grand out of pocket total of $511.22. A BIG difference from "total: $293.52," right? BEWARE that there's no accounting for the first amount you'll pay (for us, $198.38), for which you receive a "voucher" that the actual rental car company (for us Thrifty) has NO idea about. We turned down extra insurance and made sure the car (unlimited miles) was gassed up before its return. It's true what they say, if it sounds too good to be true, it probably is. STAY AWAY!