I'm one that doesn't do it. Dunno, it just doesn't feel right to me. I avoid having to fill up so don't have to get petrol very often. DH will go and do it, but on the odd occasion that I do, I'll unbuckle DS, get him out and take him in with me, even if he has been asleep. A few more minutes work, just makes me feel more comfortable. Don't know what I'm going to do when number 2 comes along though!