[steveo3318]

Keep in mind my truck is a factory 3 on the tree with a Borg Warner overdrive. I have 373 gears and in overdrive I am pulling 75 at about 2200 Rpms or so. When I had the quick fuel 750 on I was averaging 12 to 13 but I can't keep my foot out of it on take off. With the fitech I started seeing 15 to 16 immediately. Still playing at take off. I don't have any hard data on it since I have started raising the afr values in cruise but I do know this. My truck at cruise was running 13.5 afr "their safe default afr" and was running extremely low vacuum. Like 8-10. In other words staying loaded up. I change it to 17 and it ran like crap at cruise so I started backing it down. 16 afr in my 3000kpa parameter puts me about 15.4 real data at 75 mph. This raised my vacuum to 17-18. Since vacuum is a direct reflection of fuel consumption I will say it's better but I won't know how much until I fill up again. Also this may be my mind playing tricks but I swear the needle doesn't drop as fast on road trips. And it cruises a lot smoother with the higher afr. I am sure you have but for anyone messing with afr please please read up on it before you start changing parameters. You can and will kill your motor if you don't understand them.