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thanks for response. i never ventured foing leaner than 17 afr fearing missfires. but from my experience i cant rly advance timing much but the consumption reductions are still significant despite lack of much advance. the only issue is the car feels weak overall in this mode. the throttle opening requirement is significantly higher almost 90% of time. the throttle response is completely gone and sometimes the car goes very rich. this is all because of full time open loop condition and its very hard to get the maf 100% scaled. so far im running 14.7 afr with more timing. 50* vs 44* in leanburn knock free. its still very efficient, usually 30mpg highway at 70mph vs 27 mpg stock. with wgr disabled i have to retard 5-7* to prevent knock but it seems egr helps with efficiency on highway.
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