Very short commute for me. ~1 mile 1 way, but I do three round trips a day, five days a week.

Assuming 17MPG for my truck (family's only vehicle) and my yearly work schedule (in academia) I save about $300/year in gas and maintenance on my vehicle. And ride a $35 yard sale find.

But the money is negligible. I just can't justify driving a vehicle 1 mile each trip every day.