I'm experimenting with 35-45 degrees timing advance to see what gives the best mileage. My motor cruises fine at 18:1. It may even go leaner but that's as lean as my wideband can read. I went from 37 highway mpg to 47.5 by advancing it to 35 from whatever was on the base map.Cruising for me is 3000-4000 RPM (mostly 3500, short geared VTEC tranny) and less than 55kPa (right around -6 PSI). Above 55kPa I transition to 15.5 to 14.7. The part of the map that's just for heavy accel is a bit richer, but my motor likes it relatively lean. It's an OBD2 VTEC-E motor. The richest I go is 13:1 and there's no knock. I'm running 91 octane.
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