Many of the gas saving devices being advertised do not work
and can actually damage your vehicle.
After evaluating and testing more than 100 alleged gas-saving devices,
the Environmental Protection Agency hasfound only a few that improve
mileage and none that do sosignificantly.
The gas-saving products on the market seem to fall intoclearly defined
categories. These include, but are notlimited to: air-bleed devices,
vapor-bleed devices, liquidinjection devices, ignition devices, fuel
line devices,mixture enhancers, internal engine modification
devices,fuels and fuel additives, oils and oil additives, anddriving
habit modifiers.
The EPA evaluates or tests products to determine whethertheir use will
result in any measurable improvement to fueleconomy. However, the EPA
cannot say what effect gas-savingproducts will have on a vehicle over
a long period of time.It is possible that some products may harm the
car oradversely affect its performance.
For example, if an "air bleed" device actually addssignificant amounts
of air to the air-and-fuel mixture, itmay cause an engine to misfire,
a condition which greatlyincreases the potential engine damage or
mechanical failure.This is especially likely to happen on cars
manufacturedbetween 1974 and 1982, because their carburetors are pre-
setfor a maximum amount of air to be burned with the fuel."Air-bleed"
devices will not work at all on many carsmanufactured after 1982,
because these cars have "feedback"carburetors that automatically
adjust the air-and-fuelmixture rendering the device useless.
Many ads feature glowing testimonials by satisfiedcustomers. There are
too many variables that affect fuelconsumption, such as traffic, road
and weather
http://www.dontplayplay.com/html/automobile/20060925/4079.html
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