i am running 1.14 @ultra low loads <40% >1.10<55%> and 1.00 > 75% then i use lamfa for enriching for loads above 120% so 1.14 to 1.12 is fine for low load part throttle cruising not good for iddle though

OK. I've spent the last week on this issue (theoretically) for wideband cars there's a point in LAMKO-LAMDSK that sets lamdiag_w=1 when no diagnostic functions are active. The value makes it to the end if there are no other <1 values from the other enrichment functions (LAMFA,LAMBT, etc). In the end lamdiag_w doesn't get MIN with 1, so it makes it as is to lamsons_w as long as it's within lamlgm and lamlgfmn and outside of LAMSOSUF and LAMSOSOF. Those 4 limits/thresolds are fine stock.

So, all that to say this: by changing the one mov line from
mov RAM_lamdiag_w, #1000h
to
mov RAM_lamdiag_w, #10C2h (15.4AFR)

We might be able to idle/cruise lean while maintaining a calibrated LALIUS

BTW, how lean can one run? LAMLGMKT/LAMLGMTM = 1.1 in my AMB ori, but I can change that.

ive probably studied the fuel economy topic more than others on here so i want to post some stuff.

 Ive accumulated the "LAMBDIAG" address for a few different files, ill list them at the end. the only other things ive found needed is to set LATRO high enough, set LAMLGMKT/LAMLGMTM high enough and make sure any other enrichment functions are high enough. bts fueling should be able to request lambda>1 so you can pinpoint your whatever lambda, wherever you want.

Dont forget to add some ignition timing for the areas you run lean at. it takes quite a bit more advance to get lean mixtures to spark. lean mixtures also burn slower, so to reap any worthy mpg gains you have to add some timing. On e85 at 18:1 gas calibrated afr i was at about 50° of advance highway cruising and it ran beautifully up to 20:1 afr as long as i had enough advance. More advance will always result in less misfires because the plug sparks at a point when there's less pressure in the chamber vs sparking at tdc where you get misfires constantly. my idle at 18afr is actually smoother than it was at 14.7 btw, my timings around 25° for idle. i get >20 city mpg in my a4 1.8t quattro on e85 without trying.

Did you know e85 knox emissions are far lower at afrs closer to 20:1 than they are at "stoich"?

8e0909518ak 368072:  0x72456  offset- X*0.0002441406
8e0909518al 386802: 0x72F1A
4b0906018ch 360101: 0x6654A
4b0906018dp: 0x5F8B0
b5 s4 m-box: 0x3bfb2

if anybody sees this thatd be nice to update the original post with these addresses for people like myself