YES 13 A/F ratio at idle seems to work OK has a lot to do with cam timing tho, 14 to 14.5 for cruise part throttle might as well get some mileage while were at it could go higher! wide open full throttle 9.8 to maybe 10.8 A/F ratio after that your on your own! great mileage can be had while your cruising by touching the buttons on your standalone EMS. RON