This is a warning to all potential customers of Economy Car Rentals/Thrifty. We have used rental car agencies all over Europe without any problems until we booked with ECR: After our recent trip to Sardinia last fall I noticed we were overcharged by 55 Euros. Five weeks later and after 5 e-mail requests we were finally told that it was a “missing fuel” charge. What happened was this: A problem with the driver’s door lock had developed after we had the car a few days and –after much difficulty reaching anyone and being told it was most likely some stupid mistake of ours—we were told to bring the car in to have it looked at. After 2 people confirmed that it was indeed broken, they decided to give us a new car. Fine, but we hadn't expected to get one and hadn't topped up the fuel. No mention was made of any missing fuel charge at that time. I've pointed out to them that perhaps they owed us some recompense for the inconvenience but they've refused to budge. Incidentally, check in at the Alghero airport was problematic since they had only one agent to check in many cars and we had to wait 40 minutes. This company gets bad marks for inefficiency and poor customer relations!