Commuting

If you can stagger your work hours to avoid peak rush hours, you'll spend less time sitting in traffic and consume less fuel.
If you own more than one vehicle, drive the one that gets the best gas mileage whenever possible.
Consider telecommuting (working from home) if your employer permits it.
If possible, take advantage of carpools and ride-share programs. You can cut your weekly fuel costs in half and save wear on your car if you take turns driving with other commuters. Many urban areas allow vehicles with multiple passengers to use special High Occupancy Vehicle (HOV) lanes.
Consider using public transit if it is available and convenient for you.