Here are some tips on how you can become greener by lowering your fuel consumption:
Re-route your commute.
Walk or bike to work and save money on gas and parking while improving your cardiovascular health and reducing your risk of obesity.
If you live far from your office, investigate the option of telecommuting.
Move closer to work.
Even if this means paying more rent, it could save you money in the long term.
Lobby your municipal government
If your streets are not conducive to biking or walking, lobby your local government to increase spending on sidewalks and bike lanes. With little cost, these improvements can pay huge dividends in decreased traffic and pollution.