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On my civic, platinums were -5.78mpg. Iridiums were -2.83mpg. Best were the stock v-power. Pump neutral, but butt happier with indexing.
This is on a lean burn engine that is very sensitive to spark changes. Haven't tried swapping out since I added the msd though. Can, they're near new collecting dust on the shelf.
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Shooting for 600 miles of range at 65-70 mph out of a vx.
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