1) Buy a different car - If it's time to replace your old car, buy a more fuel efficient one. Alt fuel vehicles and hybrids are great options too.
2) Organize errands – Don't run out just to go to one store. Plan an efficient route so you can make several stops in a short amount of time. If you have time, call a friend and see if you can pick up something for them too.
3) Home Work - Work from home whenever possible.
4) Work Close to Home – it took Steve a few years to find a job close to home, but it cut about 40 miles of driving each day.