I've put about 250 miles on my car since I last filled it up. The tank is still very close to half full. If my gas gauge is accurate, that would mean I'm getting about 10-12% better gas mileage at 55. That would definitely be worth keeping up with gas prices very close to $3/gallon.
Nobody has run me off the road yet, but my son wonders why people keep giving us dirty looks as they flash past.