25.8 - I got that by just running around town without any larger trips. I reside in a small town where I can hit the post office, grocery store and recycling center with only 12 miles put on the odometer. 
Used up about 3/4 of the tank over the course of weeks before I took a longer trip and the MPG went back up.
Used up about 3/4 of the tank over the course of weeks before I took a longer trip and the MPG went back up. 
