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My 2015 Civic had been losing gas mileage for a while. I was getting around 36 mpg with the original plugs. I replaced them at 50,000 miles with Bosch dual platinum plugs. That didnt really change the mileage. Over time my mileage deteriorated to around 35 mpg. Ive been curious about E3s for a while but they didnt list any for my car. A couple of months ago E3 started listing a plug for the Civic, E3.82. At 82,000 miles I put a set in and yanked the Boschs. So now my mileage is a little over 38 mpg. This is driving mostly around town but a significant amount of highway driving. Performance is slightly improved too. Im glad I switched.
This is cross-posted on other forums

 
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The Bosch plugs were never the correct plugs for the car fyi. Only Denso or ngk

 
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Thanks for pointing that out Colin42. They were actually the NGKs. I use Bosch plugs a lot and I just posted it wrong. Nice catch. Now ive got to correct my other post about it. thanks again.