My lifetime MPG was about 48 and 52,000 miles later is 56.1. It would be tempting to reset the lifetime MPG because over the last six months it would be lower to mid-60s. It's taken awhile to learn some techniques.
My worst ever mpg was on December 15, 2000 when work was closed early so people could go home before the roads iced up. It was not soon enough. I was going 30-40 mph the first 30 minutes. After that, the ice and sleet turned all the roads into a stop-an-go parking lot going at 2-3 mph. The rest of the trip was four hours. Over 30 miles, I got 25 mpg. The defroster prevented autostop from working.