Lean Burn

KFLBTS lambda is limited by
 * LATRO - Upper limit lambda target for exhaust gas temperature control
 * 018ch ecu - 0X1D11E (16BIT LOHI)
 * offset: x*0.000244140625

LAMBDIAG addresses

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

XIMAX
 * 018ch 360101 - 0x4D0E (16bit lohi)

offset: x*0.000030517578
 * TT 180hp 0x16E0E

Set LATRO LAMLGMKT/LAMLGMTM high enough BTS fueling should be able to request lambda>1

Add ignition timing for the areas you run lean:
 * More advance to get lean mixtures to spark.
 * Lean mixtures burn slower

E85 NOx emissions are lowest at very lean mixtures ~20:1, requiring ~50* BTDC at cruise on a 1.8T

Sources: joshuafarwel