After picking up our Insight I pay more attention to the other hybrids on the road and noticed, some drive annoyingly slow regardless of highway or local, others floor it stop light to stop light. Granted, many car owners do this, but the parity amongst defensive and aggressive drivers is so extreme among hybrid owners.
For example, you'd be hard-pressed to find a BMW owner who drives slow/defensive.
On a side note, I got 46.6 MPG today 90% highway at 70 MPH average over a 23 mile trip. I imagine it will only get better!