I drive our Prius almost exclusively, but have taken to driving my fiancee's HH a bit more frequently lately.

If you check the mileage database, her HH gets almost 30mpg lifetime (had a bad last couple of tanks.) When I drive the HH I get 31-34mpg in 30/70 driving (according to the MFD screen), but I haven't been able to wrestle the **** thing away from her for a full tank yet! She drives clients around frequently, which adds weight and much less attentiveness to driving techniques.

I can't overstate the effectiveness of keeping tires inflated. I've kept the HH at 37/35 lately, and the Prius at 50/48 (though I'll likely bring the Prius down a bit since that's getting a little high, but my last couple of tanks have been MUCH better, even with declining temperatures.)

Rick