Richmond area here. I recently did a
piece with one of the local TV stations doing exactly what you seem to be describing. No flashy exterior identifiers -- not my style. I have a
Can-View, a device for mileage calculation (among many other functions) that integrates with the factory multi-function display. You can be the judge of how photogenic it is.
If you're interested in sitting in, we're having a Prius
meetup this Saturday. In attendance will be several high-MPG Prius drivers. You're welcome to come. Just let me know in advance.
What publication are you writing this for?
(I'd e-mail you as requested, but temporary computer issues are keeping me from e-mail at the moment.)
EDIT: E-mail sent.