Quote:
Originally Posted by philipdistefano
I still don't understand how fuel trim affects gas mileage after reading all of the posts trying to explain. Can someone just say if a negative fuel trim % gives better or worse gas mileage?  |
It should not affect fuel mileage unless they are more than 10% off.
Only because it affects which load cell it will pull timing from, as seen in the data.
Timing probably has more of an effect on fuel economy since these car all run at 14.7 A/F almost all the time.