Devices Tested by EPA
The following list categorizes various types of
“gas‑saving” products, explains how they’re used
and gives product names. Those with asterisks
may save measurable, but small, amounts of gas.
All others have been found not to increase fuel
economy.

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.
The EPA has evaluated the following products:
ADAKS Vacuum Breaker Air Bleed; Air‑Jet
Air Bleed; Aquablast Wyman Valve Air Bleed;
Auto‑Miser; Ball‑Matic Air Bleed; Berg Air Bleed;
Brisko PCV; Cyclone‑Z; Econo Needle Air Bleed;
Econo‑Jet Air Bleed Idle Screws; Fuel Max*; Gas
Saving Device; Grancor Air Computer; Hot Tip;
Landrum Mini‑Carb; Landrum Retrofit Air Bleed;
Mini Turbocharger Air Bleed; Monocar HC Control
Air Bleed; Peterman Air Bleed; Pollution Master
Air Bleed; Ram‑Jet; Turbo‑Dyne G.R. Valve.

Vapor Bleed Devices.
These devices are similar
to the air bleed devices, except that induced air
is bubbled through a container of a water and
anti‑freeze mixture, usually located in the engine
compartment.
The EPA has evaluated:
Atomized Vapor Injector;
Frantz Vapor Injection System; Hydro‑Vac:
POWERFUeL; Mark II Vapor Injection System;
Platinum Gasaver; V‑70 Vapor Injector; SCATPAC
Vacuum Vapor Induction System: Econo‑Mist
Vacuum Vapor Injection System; Turbo Vapor
Injection System.

Liquid Injection.
These products add liquid into
the fuel/air intake system and not directly into the
combustion chamber.
The EPA has evaluated:
Goodman Engine System‑Model 1800; Waag‑Injection System*.

Ignition Devices.
These devices are attached to
the ignition system or are used to replace original
equipment or parts.
The EPA has evaluated:
Autosaver; Baur Condenser; BIAP Electronic Ignition Unit; Fuel
Economizer; Magna Flash Ignition Control System;
Paser Magnum/Paser 500/Paser 500 HEI; Special
Formula Ignition Advance Springs.

Fuel Line Devices (heaters or coolers).
These devices heat the fuel before it enters the carburetor.
Usually, the fuel is heated by the engine coolant or
by the exhaust or electrical system.
The EPA has evaluated:
FuelXpander; Gas Meiser
I; Greer Fuel Preheater; Jacona Fuel System;
Optimizer; Russell Fuelmiser.

Fuel Line Devices (magnets).
These magnetic devices, clamped to the outside of the fuel line
or installed in the fuel line, claim to change the molecular structure of gasoline.
The EPA has evaluated:
PETRO‑MIZER; POLARION‑X; Super‑Mag Fuel Extender; Wickliff
Polarizer [fuel line magnet/intake air magnet].

Fuel Line Devices (metallic).
Typically, these devices contain several dissimilar metals that
are installed in the fuel line, supposedly causing
ionization of the fuel.
The EPA has evaluated:
Malpassi Filter King [fuel
pressure regulator]; Moleculetor.

Mixture Enhancers (under the carburetor).
These devices are mounted between the carburetor and
intake manifold and supposedly enhance the mixing
or vaporization of the air/fuel mixture.
The EPA has evaluated:
Energy Gas Saver; Environmental Fuel Saver; Gas Saving and
Emission Control Improvement Device; Glynn‑50;
Hydro‑Catalyst Pre‑Combustion Catalyst System;
PETROMIZER SYSTEM; Sav‑A‑Mile; Spritzer;
Turbo‑Carb; Turbocarb.

Mixture Enhancers (others).
These devices make
some general modifications to the vehicle intake
system.The EPA has evaluated:
Basko Enginecoat; Dresser Economizer; Electro‑Dyne Superchoke; Filtron
Urethane Foam Filter; Lamkin Fuel Metering
Device; Smith Power and Deceleration Governor.

Internal Engine Modifications. These devices make physical or mechanical function changes to the
engine.
The EPA has evaluated:
ACDS Automotive
Cylinder Deactivation System*; Dresser
Economizer; MSU Cylinder Deactivation*.

Accessory Drive Modifiers.
These devices reduce power to specific auto accessories.
The EPA has evaluated:
Morse Constant Speed
Accessory Drive**; P.A.S.S. Kit**; PASS Master
Vehicle Air Conditioner**.

Fuels and Fuel Additives.
These materials are added to the gas tank.
The EPA has evaluated:
Bycosin; EI‑5 Fuel Additive; Fuelon Power; Johnson Fuel Additive;
NRG #1 Fuel Additive; QEI 400 Fuel Additive;
Rolfite Upgrade Fuel Additive; Sta‑Power Fuel
Additive; Stargas Fuel Additive; SYNeRGy‑1;
Technol G Fuel Additive; ULX‑15/ULX‑15D;
Vareb 10 Fuel Additive; XRG #1 Fuel Additive.

Oils and Oil Additives.
Usually these materials are poured into the crankcase.
The EPA has evaluated:
Analube Synthetic Lubricant; Tephguard.

Driving Habit Modifiers.
These are lights or sound devices to tell the driver to reduce acceleration or to
shift gears.
The EPA has evaluated:
AUTOTHERM**; Fuel Conservation Device; Gastell; IDALERT**.

Miscellaneous.
The EPA has evaluated:
BRAKE‑EZ; Dynamix; Fuel Maximiser;
Gyroscopic Wheel Cover; Kamei Spoilers**; Kat’s
Engine Heater; Lee Exhaust and Fuel Gasification
EGR; Mesco Moisture Extraction System; P.S.C.U.
01 Device; Treis Emulsifier.


* Indicated a very small improvement in fuel
economy but with an increase in exhaust emissions.
According to Federal regulations, installation of this
device could be considered illegal tampering.
** Indicated a very small improvement in fuel
economy without an increase in exhaust emissions.
However, cost‑effectiveness must be determined by
the consumer for a particular application.