All the devices that work have been bought up by the
oil companies so we won't get the mileage. The ones
that are left are sold by the snake oil companies(in
other words they don't work) Without the proper
mixture you will either foul the plugs or burn the
valves from to rich or too lean. Fuel injection is the
best followed by a properly jetted carb. Another thing
we have to deal with is the ethanol, it makes our
older cars run hotter, the new cars love it. This is
just my two cents worth on the Fuel injection / carb
problem.

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