YES! In the Energi, I was able to get two Diono Radian RXT car seats into the back seat with plenty of room left in the middle for an additional person if I was transporting someone else.    Here's a picture of one car seat forward facing... behind the driver's seat, my other son is rear facing. As you can see, there's plenty of room in the middle. This is the typical amount of space for car seats in any smaller vehicle. If you want to fit 3+ car seats, you need a large car.