I have changed the AFR target and see leaner O2 reading. Keep in mind though in tuning for a biased for better MPG, it is not just the fuel flow being reduced but also functions like timing.

My last tests yesterday increased MPG in city from 21 to 24.

Due to engine mods, where car is located, if water/meth is being used fuel can be saved which of course some hit to performance but the goal is to have multi tunes and when the need is to save on fuel costs to run a tune biased for it.