I was surprised to hear this since the voltage output is different on all 3:
1) 45W, 14.4V
2) 60W, 16.5V
3) 85W, 16.5-18.5V
But I was able to find this page that does seem to confirm it. Can someone explain why we can use any of them? I couldn't find any good explanation. I guess the computers are smart enough to only draw what they need?
http://support.apple.com/kb/HT2346
I have an extra 85W adaptor for my MBP at work and would love to be able to use this with the MBA regularly (without any bad side effects like ruining the battery or something like that).