Anchoring a carseat with the belt is best accomplished by two people. One person to kneel in the carseat and take up slack, the other to actually pull it taught. I initially didn't trust the belt, but our kid is actually getting close to the weight limit, so we had to sack up and get comfortable with it. When done right, it's just as secure as the anchors. Of course, then you never want to move the seat because it's a PITA to get it tight again. Doing it in a two door will be... fun.
'76 911S | '14 328xi | '17 GTI | In memoriam: '08 848, '85 944
"Here, at last, is the cure for texting while driving. The millions of deaths which occur every year due to the iPhone’s ability to stream the Kim K/Ray-J video in 4G could all be avoided, every last one of them, if the government issued everyone a Seventies 911 and made sure they always left the house five minutes later than they’d wanted to. It would help if it could be made to rain as well. Full attention on the road. Guaranteed." -Jack Baruth
"Here, at last, is the cure for texting while driving. The millions of deaths which occur every year due to the iPhone’s ability to stream the Kim K/Ray-J video in 4G could all be avoided, every last one of them, if the government issued everyone a Seventies 911 and made sure they always left the house five minutes later than they’d wanted to. It would help if it could be made to rain as well. Full attention on the road. Guaranteed." -Jack Baruth