I was at 2.7, but it was hard for me to calculate it since I live in a dorm. Technically, ALL of my meals are prepared "out of the home", except that it's all dining hall food, and made just like you'd make your own food at home.
Secondly, aside from cheating and saying my nonexistent car gets 100% fuel efficiency, there's no way to take out the car factor, except that I don't own one.
I had no way to calculate the expendeture on electricity so I left them blank. We have a coal plant right next to the campus and a nuke plant about 15 miles away. On a good clear day you can see both lol.