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When I first bought my LS3, I was getting about 15-16. Lately, I've been averaging about 17-17.9. That is about 50/50 city/hwy. That also includes opening up the throttle every now and then.. When I do let it rip, I do not redline the engine... I always run premium 92/93 octane depending on what is available.
Personally, I think your numbers sound normal.. You have an auto. So, 1-2 mpg less in the city is expected. I don't think your mods would have negatively impacted you unless your tuner is making you run a richer fuel mixture.
When did you notice the change? after the tune?
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