Just tried The 2015 Mustang with a baby seat.
Very surprised how well it worked just thought I'd share with you guys
The seat is in the car without the base. I did not find that hard to put into the car.
Good to know and that is for sharing! I have a car seat in the 2013 GT I'm driving this week (borrowed from a friend as he uses my pickup) and I was happy how that fits for my 4 1/2 year old too. I was curious how it was going to work when my 2015 gets here.
Single dad of 3 year old girl here. Usually I just leave the passenger seat forward. Occasionally someone has to come with us and I'll move seat forward a bit. Tootie curls her feet up Indian style and sits comfortably. I do usually take her shoes off so if she kicks or something it won't mar the leather. I keep a twin bed sheet folded up (cut slits for the latches) over the whole seat and a terry cloth towel under and behind the seat
The big difference from my 11 to the 15 is the passenger seat doesn't lean as far forward as the 11 did so it's a little harder. She can climb in and get in seat though which makes my job a little easier.