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I replaced recently the spark plus in my 2003 DI , according to Hanes opening of the Sparks can be .048 to 0.056 so I put NGK platinum .052 opening. But I noticed that im using more gas since I replace them. Normally I had 325 miles per tank but now I got 295 only. My driving habits are the same. Have somebody had the same issue or a Similar experience?
 

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SPARK PLUGS

Engine Spark Plug Gap Thread Size

2.7L RE10PMC5 0.048 TO 0.058 in. 14mm (1 in.) reach
3.5L ZFR5LP-13G 0.048 TO 0.053 in. 14 mm (3/4 in.) reach
 
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