| anything below 10 is fat rich. on a dyno, your A/F shows richer then actual street driving. so when you tune for 12:1 on a dyno, you are actually getting about 12.5:1 or 13:1 on the road... By tuning on the road, you are using real world conditions to dial your car in more accurately. You can also determine if you have problems with your car if your A/F begins to change over time.
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