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There has not been any A-B-A testing done to confirm their advertised gains, so they are considered baloney until proved otherwise.
well that's the problem. somebody needs to test them properly. i guess that's going to be me.
we need to think a little about combustion physics. why does the Fit have two spark plugs per cylinder, coil-on-plug ignition, variable valves, high-pressure fuel injection, complex computer controls, and so forth? must be to get better combustion, surely? would you have dismissed these "mods" before they were introduced as "baloney"?
and why do these cars still have catalytic converters? it means there is still a lot of unburnt fuel leaving the engine. so clearly there is plenty room for improvement.
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