Yeah, we're seeing 11-12L/100km in all city driving in the HL, which a GX can't come close to. I'm not a "hypermiler" by any means, but do drive smoothly.
So, as comfy and solid feeling as the GX was, watching the gas gauge drop with every second of driving was not fun. The LX is worse.
One thing we really liked about the GX was the third row. It's an old-fashioned set up with removable seats. I liked that as there's no cargo compromise when the seats aren't needed. You have to haul them out, but worth it to me.