I can get 29-32 MPG if I pay attention to "hyper-miling" techniques.
I try to use the brake as little as possible. I mostly control my highway speed using ACC and manipulating the various buttons on the steering wheel.
Example... if I am on a flat straight-away and I see my MPG is only around 26-27 on the display, I find that a quick "tap" on the CANCEL button (watch the MPGs go up to about 70-80 MPG) and then tap RESUME... it appears that the computer will choose a higher gear coming back online and I can usually get the same span of road back up to about 30-40 MPG at that speed.
If I see brake-lights ahead, I tap CANCEL and let it coast on its own until I can see that I will not NEED to slow down, then tap RESUME.
I shut the van off at traffic lights that I KNOW are long and that I'm stuck at.
I can set the ACC to it's "nearest distance" behind a bus, truck or large box-van on my commute and I see the MPGs rise from being within the wake of said vehicle... yet it's not too-close to be unsafe.
Etc. etc. etc.
All these things together, I can actually get a *COMBINED* 2-3 day MPG reading of about 31-MPG.
"I'll procrastinate later..."