Spark plug OEM FORD or OEM Mazda
I'm pretty sure that modern Mazda's do do this, only not in the situation you're describing. They use it for their stop start system to save having to fit a beefier starter motor and what not, simply inject an extra dose of fuel and fire the spark plug to get the engine going again.
Pros: saves beefier starter motor
Vehicle:
Mazda 6
Ours has been pretty reliable, had some issues with odd stalling once which was cured with new plugs/wires/carbon cleaning, rear shocks just went recently.
Pros: cured stalling issues
Cons: rear shocks went recently
Vehicle:
Mazda 5
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