In the US the 914 was marketed as an entry level Porsche, or a 912 Replacement.
The magazine ads went The 29 MPG Porsche, The Sun Porsche, The City Porsche, The Space Porsche, and The Weather Porsche.
In Europe the 914 was marketed as a VW Type III Karmann Ghia replacement, the more familiar to US consumers Type I based Karmann Ghia was still in production.
The magazine ads went, Meister Aller Kurven, Der Mittelmotor-Porsche, and Nichts Bringt Schöner In Farht, and Die Härteste Teststrecke Für Sportwagen.
Readable Porsche literature can be found here,
http://www.thesamba.com/vw/archives/lit/356.phpAnd a couple of ads can be found here,
http://www.thesamba.com/vw/archives/ads/adsporsche.php