'Fuel Economy' and Exhaust Emission
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Fuel Economy Products Evaluated by EPA
EPA tests products to determine whether they significantly improve fuel economy as claimed in their ads. However it does not conduct any durability tests and long-term harms cannot be determined. It warms that on board diagonostic of modern vehicles' sophisticated emission control systems might be adversely affected by retrofit of certain equipments.
These Auto 'Fuel Economy' Products Don't Work - EPA
EPA found the following products, while improving fuel economy only very slightly, increase exhaust emissions. FTC informs us that 'According to Federal regulations, installation of this device could be considered illegal tampering.'
Air Bleed Devices
These devices bleed air into the carburetor. They usually are installed in the Positive Crankcase Ventilation line or as a replacement for idle-mixture screws.
Fuel Max
Liquid Injection
These products add liquid into the fuel/air intake system and not directly into the combustion chamber.
Waag-Injection System
Internal Engine Modifications
These devices make physical or mechanical function changes to the engine.
ACDS Automotive Cylinder Deactivation System
MSU Cylinder Deactivation
Source FTC's "Gas-Saving" Products: Fact or Fuelishness?
Last Update: April 25, 2004.