Our Terms of Service and Privacy Policy have changed.

By continuing to use this site, you are agreeing to the new Privacy Policy and Terms of Service.

GPS systems that save gas

Instead of just getting you where you're going, some in-car navigation systems can get you there more efficiently.Instead of just getting you where you're going, some in-car navigation systems can get you there more efficiently. By Peter Valdes-Dapena, senior writer

NEW YORK (CNNMoney) -- Ordinarily, you want a GPS navigation system to show you the quickest way to get where you're going. But with gas prices over $4 a gallon in some cities you might rather know the way that uses the least gasoline.

Some new navigation systems can now do that.

But if you're in a rush you should know this: Sometimes using less gas might take a little longer.

While ordinary GPS routing relies on data like the expected average speed on various roads, "Green Routing" or "Eco-Routing" adds in other factors, said Mark Burfeind, a spokesman for TeleNav, a digital mapping company that supplies an "Eco-Route" system used in some Ford Motor Co. vehicles.

Among the factors Ford's "Eco-Route" system looks at:

  • Hills -- Going uphill uses more gas.
  • Curves -- Slowing down then speeding up around curves uses more gas.
  • Stoplights and stop signs -- Having to stop -- and then get going again -- uses more gas.
  • Traffic -- Stop-and-go driving, idling and driving at very low speeds all use more gas.

Of course, many GPS systems already take traffic into account, but it's given greater importance when calculating an "Eco-Route." There may be cases in which driving through a traffic jam would be quicker because it's more direct, but driving around it would actually use less fuel.

Also, slower roads can be more fuel efficient. Once a car is going fast enough to use its highest gear, every mile per hour faster reduces fuel economy. So driving on a 50 mile per hour road, provided its straight and without stop lights, might be be preferable to a 65 mph rural freeway.

Compared to using the "fastest" route, Ford says its researchers found that using the "Eco-Route" option offered as much as 15% reduced fuel use in some of their vehicles. Map data company NavTeq, creator of a similar system that will be used by Hyundai in Europe, estimates a more modest 6% improvement. To top of page

Find Your Next Car
Index Last Change % Change
Dow 17,081.89 -49.97 -0.29%
Nasdaq 4,796.61 -42.03 -0.87%
S&P 500 2,003.69 -13.77 -0.68%
Treasuries 2.06 -0.03 -1.67%
Data as of 11:17pm ET
Company Price Change % Change
Bank of America Corp... 15.52 0.00 0.00%
EMC Corp 27.55 -0.80 -2.82%
General Electric Co 27.87 -0.22 -0.78%
Alcoa Inc 10.03 -0.05 -0.50%
Intel Corp 32.04 -0.17 -0.53%
Data as of 4:02pm ET


JPMorgan's earnings report on Tuesday show how the late summer market chaos and low interest rates hurt its business. More

A big tax hike on the rich won't reduce inequality in America much, new study finds. More

American and British police have managed to stop a massive hacking operation that infected computers worldwide, stealing at least $10 million from the United States alone. More

This pension fund mistakenly overpaid 589 retirees, and now demands that they pay it back -- with interest. More