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Tuning for power enrichment scenarios (aka wide open throttle) has absolutely no impact on your fuel economy. No, you do not need separate tunes, because maximizing WOT performance has nothing to do with your part throttle fueling or timing.
You don't really need separate transmission tunes, either. I'm pretty sure you can make normal drive tame and optimized for normal driving, and set up sport mode to be more aggressive. I haven't really dug into A6s.
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