[ever_green]

For my car I have programmed the ECU to set 16.2:1 AFR as lambda 1.0. this means every time it's targeting 14.7 afr it's actually doing 16.2. I have confirmed this with wideband. Ignition timing wise i could not add much more than 2-4 degrees depending on load/throttle before onset of knock. I also experimented with going leaner to 18:1 but I experienced minor (but persistent) knocking or detonation at cruise. So is it worth going any leaner at the cost of ignition timing? So far consumption for last 1000 kilometers have improved by 9% with 16.5:1 AFR.