blacknight
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BPR6EF-13 is the OEM plug for the S/C version. I read that it is the plug recommended for highway driving and the city center. I've now transferred to the city with lots of stop and go traffic within 20sq.km (house / shopping / work / hobbies). should I change to a hotter plug like the BPR6EF-11? Reason i'm asking is because my mileage has gone down the drain. Car is well maintained, tire pressure, empty boot and my driving is rather conservative in the city. I've read where owners had melted the tops of piston heads and the engine will run hotter if i change to a hotter plug. Will this happen? The plug gap for the 11 is 1.3mm while the OEM plug is 1.5mm. Is a smaller plug more economical and easier on the coils?