Thanks so much for the info!
So my interpretation is that if we toss the EPA estimates to the wind and just rely on actual tank mileage, the Hybrid gets at least 20% better mpg than the exact same car without the hybrid technology. I think that's a pretty important issue since many people on this website (including me) have used the advertised EPA estimates as the gold standard to base the quality of their car on.
But maybe until the EPA revises their estimates, the true test is a relative one with other similar cars that one might have bought instead.