So I took mine to the dealership to have all three recalls addressed (faulty airbag sensors, waterproofing the wiring harness, and reflashing the ECU), and the UltraGauge does show a difference with the new ECU tune. Before, startup fuel flow would be around 0.35 Gal/Hr, but now it's dropped down to .28-.31 on startup. They actually had all three jobs done in an hour, which was pretty surprising. I had planned on camping out for a few hours.
Seeing the possibility of engine damage in the service mailer got my attention. I had figured it was running the mix too rich and washing the oil from the rings, but thankfully mine doesn't seem to be harmed by it.