The sad truth is that a gas guzzler emits as much CO2 as some homes! That's the bad news. The good news is that anything you can do to improve the fuel efficiency of your car will have an impact. On average, a passenger car emits 11,400 pounds of CO2 each year while a home emits 9,000 pounds of CO2 per person each year in the United States.

Horribly inefficient SUVs, minivans and pickup trucks now make up more than half of the cars on American roads. The real tragedy is that automakers could double the current average fuel efficiency of SUVs if they wanted. Even improving fuel economy from 20 miles-per-gallon to 25 miles-per-gallon would prevent 10 tons of CO2 from being released over a vehicle's lifetime.

Buying a fuel-efficient car (like a Hybrid) is wonderful. In fact, replacing your gas-guzzling car with a fuel-efficient one is by far the best thing you can do, out of all your choices. But not all of us can do that - at least, not right now. So, in the interim, there are things you can do with the car you drive now to conserve energy and be more fuel-efficient.

Drive less. Every year, Americans as a whole drive more miles than they did the year before. Stop this trend. Telecommuting and public transportation are great options. Leaving your car at home two days a week will reduce your CO2 emissions by 1,590 pounds a year. Even piling multiple errands into one trip helps and if you can walk instead of drive, even better.

Get your car tuned up. Just a simple tune-up often improves fuel efficiency. Studies have shown that a poorly tuned engine can increase fuel consumption by as much as 10-20 percent.

Slow down, don't race your car's engine, and watch your idling. All of these save on gas (saving you money) and have a big impact on burning gasoline. You can save gas by turning the engine off and restarting it again if you expect to idle for more than 30 seconds.

source: Earth Day Network