After using this module for a few weeks I sent it back to Revain. I didn't notice any increase in gas mileage, power or anything else. I drive a 2011 Impala with a 3.9 V6. Tried 92 and 87 octane gasoline. I have purchased several items from Jet Industries and they have all been more than satisfactory. I'm trying the Stage 2 module. See my report when I've tried it for a few weeks. As for step 1, forget it.
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