E3 sparkplugs, coil packs performance

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hey guys i got a few questions for ya. my gas mileage has been droppin here for a few months and i'm tryin to resolve this problem and maybe even get better mileage. i hear alot of stuff about these E3 diamond fire sparkplugs and i'm wondering if they are all that they are put out to be. i'm also thinking about upgrading my coil packs, wondering if you guys had any insight as to which ones to get, what kinda performance i might see. and even if they are worth my time upgrading. also wondering what other mods i should be doin at the sametime if i'm gonna do the E3's and coil packs. your help would be greatly appreciated fellas.
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