Direct fuel injection isn't exactly a new technology, but it is new to most automotive consumers. Isuzu introduced the first gasoline direct injection vehicle to the US market in 2004 (anyone remember what it was called? Click the "comments" link below -- no fair looking it up online, that's cheating!). Today, Audi and Volkswagen are probably the most prolific purveyors of direct-injection gasoline engines; they call it FSI (for Fuel Stratified Injection, although I'm sure it stands for something much more impressive in German).
I've got direct injection on the brain because I'm just putting the finishing touches on my review of the 2008 Cadillac CTS, which offers an optional direct injection engine. Cadillac recently introduced a direct-injection V6 as the base engine in the 2008 STS. With 35 MPG CAFE on the way, you can expect to see more and more vehicles with direct injection under the hood -- so I've put together an artcle that explains what direct fuel injection is and how it works. -- Aaron Gold
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