PaulR33 - are you getting better economy than with stock computer? I'm getting my PFC tuned on Saturday, I used to get about 10L/100 on the highway but last week I got about 12L/100kms on stock computer.
Commodore 3.8L's autos can do 10L/100km, my 2.5 Turbo manual I thought would be able to better this as I wasn't driving hard at all!
When I get the tune done I'll check cruise AFR - they should be 14.7 due to 02 sensor - I was suprised in one of your threads to see you mentioned 12.5 at cruise? You should be in closed loop then...
I was thinking due to me not being hard on the throttle much iwould have probably been in closed loop for most of the highway driving so I dont see how PFC will help much...maybe a bit more timing at low loads..??