The AFR won't change but your fuel trims will have. The ECU has target AFRs in and will alter the injector duration to suit. Look in measuring block 032 to see what its doing now.
By lower readings do you mean l/100. Again due to the lower injector duration, it will be calling lower consumption. My own Polo claims to be doing low 3s most of the time, the injectors I am running are 1.75 times as big as the stock ones.
Gavin
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