MPG has been a hot topic, especially on greenhybrid.com.
We purchased our 06 HyHi used in February 06 out of FL. On the drive back home to AZ we wasted no time and much gas and averaged around 26 over the whole trip (23 at worst and 28 at best using manual calc.) at 80+ mph.
Now after driving it for almost 5 mo. I have found the EPA Est. fuel mileage to be quite optimistic. In fact my observation has been quite the reverse of the EPA Est. 33city 29hwy. I usually get 29-30.5 mpg on the hwy back and forth to work, and around 26 in the city. And to obtain that 30.5 on the highway, I had to drive it like a hypermiler, using the Pulse & Glide technique, though I use the A/C as needed. I also observed that the first 5 min of driving if the vehicle has sat long enough to cool down is the most in-efficient. I usually see about 20mpg on the consumption screen.
So although somewhat dissapointing, the mileage is still quite good for a vehicle of its size. I do enjoying having over a 500 mile range with the vehicle as well.
I Hope this helps..
AZJet