Hi mate, I've got the Holden V8 with AFM and yes it makes a hella difference with a tune - get 40 MPG most of the time around town:
http://youtu.be/CRssVliuWlc
and 25 MPG cruising 90 MPH unrestricted highway, around 40 MPG 70MPH freeway:
http://youtu.be/aX-uYag1yM8
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