Did you make a commitment on Earth Day to begin driving more green, but you aren’t quite ready yet to make the commitment of buying a new car to do so?

Here are some tips that can help you drive green, in your current vehicle or in a new one:

• Drive Sensibly. Aggressive driving wastes gas – it can lower your gas mileage by 33 percent at highway speeds and by 5 percent around town. Sensible driving is also safer for you and others, so you may save more than gas money.
• Observe the Speed Limit. While each vehicle reaches its optimal fuel economy at a different speed (or range of speeds), gas mileage usually decreases rapidly at speeds above 60 mph. You can assume that each 5 mph you drive over 60 mph is like paying an additional $0.24 per gallon for gas. Observing the speed limit is also safer.
• Lighten the Load. Avoid keeping unnecessary items in your vehicle, especially heavy ones. An extra 100 pounds in your vehicle could reduce your miles per gallon by up to 2 percent. The reduction is based on the percentage of extra weight relative to the vehicle's weight and affects smaller vehicles more than larger ones.
• Don’t Be Idle. Idling gets 0 miles per gallon. Cars with larger engines typically waste more gas at idle than do cars with smaller engines.
• Use Cruise Control. Using cruise control on the highway helps you maintain a constant speed and, in most cases, will save gas.
• Use Overdrive Gears. When you use overdrive gearing, your car's engine speed goes down. This saves gas and reduces engine wear.

Source: Driving More Efficiently

More Tips: Driving Green: Tips for Improving Your Fuel Economy