It's easy to install and works on my Silverado even though I didn't disconnect the battery. Since I installed it it hasn't run on 4 cylinders once and it doesn't drain my battery. It goes off when I turn the key. The truck feels like it's regained its pep, but I also installed it after replacing the rocker arms and jacks a second time. I hope this product saves me from having to do this a third time. I can't give a proper mileage rating in this review as I haven't tracked it, but I will and will update when I do. Again, this is a truck. UPDATE: I literally just overhauled my motor and burned it out while using this product. you have been warned
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