Like in those NACA reports.
I just wanted to point out that it was used on automobiles, which are usually at least perceived to have longer service intervals. (Whether they actually do or not.) Of course, it was used on Saabs, which are usually perceived as having short service intervals and low reliability.
http://www.saabcentral.com/trivia/mileage.php
Oh well. :P
Pre-turbo injection is certainly much much cheaper. When I work out a WI system, it's going to be multi-port, and I'm going to do my best to get it CARB Exempted. Otherwise I'll fail emissions. (Some people pass, but not if you end up at the notorous "test only" stations. Then you're toast. I have quite a bit of experience with that ... dammit.)
Adrian~