The origin of the Vorsprung durch Technik tagline

I really like this interview with Sir John Hegarty by The Guardian on the famous Audi tagline Vorsprung durch Technik, it shows that vision trumps insight:

It is hard to overstate how important the tagline was at the time in redefining Audi as a brand. The ironic thing was that I never found out what it actually meant (roughly forward leap through technology) until I worked with a student on his gap year in the oil industry in the early 1990s.

This was before Google Translate would resolve immediate curiosity.