Jump to: navigation, search Fuel saving devices are sold on the aftermarket with claims to improve the fuel economy and/or the exhaust emissions of a vehicle. There are numerous different types of device; many purport to optimize ignition, air flow, or fuel flow in some way. An early example of such a device sold with difficult-to-justify claims is the 200 mpg carburetor designed by Canadian inventor Charles Nelson Pogue. The US EPA is required by Section 511 of the Motor Vehicle Information and Cost Savings Act to test many of these devices and to provide public reports on their efficacy; the agency finds most devices do not improve fuel economy to any measurable degree.[1] Tests by Popular Mechanics magazine also found these types of devices yield no measurable improvements in fuel consumption or power, and in some cases actually decrease both power and fuel economy.[2] To know details click this link http://www.toyota.com