"Fore-aft" distance is what I meant. Essentially, the distance from the back of the child's seat to the driver's seat. In nearly all vehicles we own (including mid-sized SUVs), it's a close fit to install a baby carrier. In some cases, the front seats will be pressing against the carrier (unavoidable in some cases). With a full base, it's very obvious when the carrier is being pushed up too far by the contact and we need to adjust.
Ah, ok, and thanks for clarifying. The Kioma base is low profile (vertical height), and only 1/2 inch out from the passenger seat upright face (your "fore-aft" distance). It does not extend out past the seating face of the passenger seat, or otherwise hang off the passenger seat. Low and slim generally results in a shorter moment arm from the anchorage point (where the latch/isofix mount points are), so reduces the collision forces for the seat/baby.
The Kioma seat is about a standard length, and the width is narrower than competing seats while fitting the same size baby.
Fun fact: the International Standards Organization (ISO) helpfully defined several envelope sizes (r1, r2, etc) to help with baby car seat standardization, and the EU crash regs (see UN r129) even have a test bar that represents the back of a driver's seat.
Sorry, darn auto-correct on my phone.
"Fore-aft" distance is what I meant. Essentially, the distance from the back of the child's seat to the driver's seat. In nearly all vehicles we own (including mid-sized SUVs), it's a close fit to install a baby carrier. In some cases, the front seats will be pressing against the carrier (unavoidable in some cases). With a full base, it's very obvious when the carrier is being pushed up too far by the contact and we need to adjust.