I travel a great deal for my current job, which means I also use a lot of rental car companies in every city that I travel in and out of regularly. I don’t usually have too much of a problem. My biggest pet peeve would have to be when I clearly ask for a non-smoking vehicle as I have a bad asthma issue with smoke and it is even more clear that either someone violated their rules or they simply ignored my request. I usually find this out often when it is too late and I have already been on the road for a while and I have no time to turn back in order to make my meeting on time. It will happen with one click of the air conditioning or heating unit in the car and blasting through the air filters is that awful hint of smoke that just irritates the senses and seeps in my business clothes. It make me so furious that they cannot at least have the courtesy to check the air filters and have their cooling and heating systems properly maintained. After all they are asking so much money of us to rent their cars daily, the least they could do is schedule a regular HVAC maintenance provider to come in and replace out the filters on a regular basis for the air filters are where the real problems lie. I know I have a lawsuit if I really want to do something about it, since it states clearly in my contract that I have an asthma allergy to smoke and requested non-smoking car for my business use.