mmmm, 3 miles one way for me, 1 mile for the wife. 8 miles total for the day if we just use the car for commuting. It's sad, because I can't get her to bike or walk that distance, so I either let her warm the car up for 10 minutes each morning, or I use it and it's warm when she gets to it (I work nights, she days, works well) so she doesn't let it idle.
no winning for me unless it's summer and 60+ outside. I hate short drives like this, it really wears the car down fast.