the 87 around here is at $2.95 or so per gallon. i was surprised, today, when i drove by. it's mostly been hovering around $2.50 and $2.75.
with our prius, we buy gas once a week and it's usually 7-8 gallons. we're averaging about 400 miles per 7-8 gallons, and most of our gas bills in the last few months have been between $20 and $25. we're very happy with our prius.