Pretty much none.

  Although there is a post somewhere detailing exactly which models have this engine, the location of this info escapes me right now.  Somebody know what cars had the G16??

I know that you have to inspect the 1.6 engines in some Geos as they are not Suzuki engines, so look carefully before buying what you think might be a G16 in a Geo car!

The Suzuki 1.6 is pretty much limited to the Tracker and the Metro.  The Geo Prizm is a Toyota, and the Geo Storm is an Isuzu.