I grew up with a .04 limit, and that was a little more than three beers for me. It takes a six pack to get me over 0.08, and at that point I am falling down, wearing the lamp shade, obnoxiously drunk. I mean, "hold my beer and watch this" drunk .
Add to that the average two hour time it takes from arrest to blood draw (metabolizing about 0.02 per hour during the wait), 0.08 seems like an awfully high limit.