This was an 'emergency' (stuck in traffic on the highway)... It would not have been that low otherwise. I was literally less than 6 miles from work (and a gas station) when the 70mph traffic came to a dead stop ahead of me. I still had a bar on the gas guage and around a 40mile readout instead of 'Lo'. Sitting at a dead stop on the highway and then crawling along at inches per hour for 15 minutes brought it to this.
For your reference, since you seem so concerned, from the 9 times I've filled my tank so far, the average # of gallons I put in per fill is 8.87 gallons. This is at 2 bars on the gas gauge as well. So it being this low is certainly not "constant" behavior for me.