Here in WA it's up to 10%. Especially in winter. My favorite station uses ethanol year-round though, so I'm changing my AFR table to 14.15 in the lowest sections, instead of 14.70. I also changed the BRZ port scalar 4.6%, since that was about how far it was off in CL. I know it gets the best mileage when it is just the tiniest bit lean in OL, so 14.15 should be a good target. This is the only table with AFR ratios I could find. It's an Open Loop table, but I think it is referenced for Closed Loop as well. See pic for more info. @
thambu19, I only changed the 14.70 cells, or do you think I should re-scale the whole table 3.7% richer