Part of the problem is that you just got this bike. When you first get one of these bikes, they are amazing, and it's hard to stay out of the throttle. Once you've had it for a while, your fuel mileage should improve.I too have a 117 and hit reserve at 90
Mechanic says carb is not tuned rich.
I have an e-carb which I understand S&S intended for <=100ci engines so I'm getting a G-carb with a matching intake manifold that won't have the restrictors that my (05) currently has on it.
I don't expect a larger diameter carb to improve miles per tank so also getting new plugs.
At <10k miles in total I wouldn't expect the plugs to be bad but it is a 15 year old bike so it can't hurt.
There must be something else, maybe I'm spending too much time idling in DC trafffic