Any child safety seat should fit into the civic. Some are larger than others, but depending on where you place it and whether it is forward or rearfacing will determine how much leg room you will lose with the front passenger seat. For those who commented about it fitting behind the driver's seat with no problems I would suggest placing the child seat in the middle seating position if you only have one child seat that needs to be installed. The only drawback to the middle seating position is the fact you can't use the LATCH anchors. There is no trade off safety wise when it comes to the LATCH system versus the seatbelt system in the vehicle. The only advantage of LATCH over the seatbelt system is if you will be moving the child safety seat from car to car it is typically quicker to install using the LATCH system. If you do want to use a LATCH seating position, I would highly suggest the right rear seating position. Reasons being; if you parallel park you are standing on the curb to get the child out of the car, not in the middle of a traffic lane, if you need to glance briefly over your shoulder to check on your child it is much easier to see the right rear seating position than the left rear seating position which is directly behind the driver's seat, thiurdly, my experience with t-bone traffic accidents are that much vehicles which are t-boned are struck on the driver's side. Remember that when you enter an intersection, the traffic from your left is your first threat. Phew, with all that being said, choose a seat that is going to fit your needs best. Higher price doesn't mean safer. All seats on the market all pass the same government crash tests performed by NHTSA. If they didn't pass, they wouldn't be sold.