I only got 32.6mpg on my first tank but now I have a quarter left of my second and my average is up to 35.7mpg. I think that, along with the comments stated by other posters earlier, you also have to consider that everything still needs to get broken in. I’m guessing that since the ICE doesn’t run as much as a standard vehicle that it may take a little longer for this to happen. My TCH is my first hybrid (not counting the FEH that I get to drive once and a while at work) and I’m still getting used to driving it. I can’t really complain with 32mpg on the first tank because I usually drive 80+ on the highway when I can and my old 6cyl Taurus would only get 19-20mpg.

I do notice, however, that if I get on to the highway and get up to speed quickly I can maintain a constant speed with the gauge reading 45-55 mpg if the road is relatively flat.