I've gone thru a full tank of fuel of nothing but city riding, with very short highway runs.
Bike computer says my consumption was 4.6 liters / 100 km, and I managed to go 435 km with less than 2 liters remaining in the main tank.
So as the weather warms up, my mileage will improve. I have yet to do a long overnight trip with mostly interstate and rural highways, but that's coming in April or May. I'm delighted with the adv tank setup. I'm still going to try a Givi topcase installation.
ADV decals, patches & flag? Here