Guaranteed to rip you off...Avoid at all costs!?We booked a small SUV over the internet for round about $300 but when we arrived Thrifty played what I now know to be a common scam of theirs. Apparently, they didn't have our SUV in stock so where upgrading to the next sized model free of charge. We payed another $100 for an additional driver, another $60 for an infants car seat and another $120 to hire a sat nav. An american friend of mine later told me you can buy sat navs in the US for less than $60. Another little scam they play is to charge you for a full tank of fuel...Their price for a full tank of fuel in my case was about $15 more than a tank of fuel actually cost. This wasn't mentioned anywhere when I booked the car. ?And now we come to the big sting... when we returned the car they'd charged us $120.00 for upgrading to a larger SUV. There was a black guy named Joe managing this particular branch near Boston Logan and guess what... he didn't even have the authority to authorise a refund and we'd have to get in touch with Head Office. So we have a branch manager with no financial authorisation level whatsoever; well at least when it comes to dealing with refunds. More annoying was that he was completely ignoring my complaints and focussing on another member of our party who was trying the softly softly approach. This guy had clearly developed a thick skin from dealing with irate customers. Of course we'd signed for the upgrade when we took the car so had consented to having the additional $120 dollars debited (or so we were told). Trust me when I say there was no room for misunderstanding; it couldn't have been made any clearer that the upgrade was free due to it being their fault. Why are they even booking cars out when they know they're already booked? Thrifty are amongst the worst companies I've ever dealt with. They think nothing of accepting bookings for cars they don't have and then rip you off for an upgrade. A $300 car ended up costing us over $700! I say again; avoid at all costs!