5 of 11
BACK NEXT
Gizmo gamble
Gizmo gamble
Plug the Kiwi into your car and find out if you're getting the highest MPG you can.
Q. I've seen gadgets that promise to improve my fuel economy. Do they work?

A. The U.S. Environmental Protection Agency has tested hundreds of these gizmos. Some have you add liquids or pills to the tank; others have you add an underhood magnet or a vortex generator in the air-intake system.

So far the EPA has found none that delivers significant savings; some can even damage your engine. The only devices that stand a chance of improving your miles per gallon are those that modify not the car but your driving habits.

Consider a real-time fuel-economy reader - such as the Kiwi ($299) - which installs easily on your dash and includes lessons to help you accelerate less aggressively and otherwise drive in a way that reduces your mileage.

NEXT: Dump your gas-guzzler...

Last updated August 12 2008: 6:04 AM ET
More Galleries
8 of the world's craziest fast food items American food chains operating abroad must cater to local tastes to succeed. The results are spectacular. More
Inside the $50,000 Emmys swag bags If getting nominated or presenting an Emmy award isn't prize enough, celebrities come away from TV's big night with luxury goods and vacations worth $50,000. Take a peek at some of this year's luxe giveaways. More
10 most expensive cars sold at Pebble Beach These multi-million-dollar cars sold for top dollar at this year's Pebble Beach collector car auctions. More

Special Offer
Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.