Quote Originally Posted by darkhorizon View Post
you cant change "fuel settings" because you will constantly be in closed loop, which corrects for any fuel changes you make.

Best things you can do is disable cat warm up timing cut, and disable alot of the warmup enrichment settings. After that add a ton of timing.

Then you can try going open loop and running lean cruise.
Agreed, open loop has definitely been working well for me. I set the baseline AFR for all cells at operating temperature to 14.7, and then I use the AFR adder in the cruise cells to run lean. Had to tweak the timing in those cruise cells to work best for the leaner AFR.

Also agree with fivefinger though, you should be getting around 30ish highway to start with. I'd make sure your front O2 is working correctly. I have found they can give totally bogus readings and not necessarily set a code.