I read a thread on aus.bicycle, or maybe one of the alt.bicycles.* groups, a month or three ago, about new computer controlled airlines on garage forecourts, ones where you preset a pressure on a digital readout.
The guy starting the thread had had great success with these machines for roadbike use, until he came to inflate a tube from flat. An almost instantaneous explosion resulted. After blowing a second tube/tyre apart he withdrew for a rethink, posted to usenet, and found out that although they are very accurate for high pressures, they have one huge drawback for bicycle use... if the initial pressure is below a certain value, then an average car tyre volume of air is dumped into the tyre before the computer takes another reading.
Can anyone find the original thread?