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For the 1.8L LS (Gen 1), the plug gap has always been 0.028".

For the 1.4T (LT, ECO, LTZ) (Gen 1), GM originally had the gap set to 0.033-0.035". After we proved to GM that the plug gaps were all over the place they came back with 0.025-0.028". It doesn't matter what the conductor material is - copper, platinum (don't use), or iridium. The problem is that once your plugs erode to 0.037 these cars start to get spark blowout.

Take a look at the bottom part of the first post at http://www.cruzetalk.com/forum/34-gen1-1-4l-turbo/46833-new-copper-spark-plugs.html. I analyze the gap erosion rate of the OEM plugs in this post. It also links to GM's official statement regarding spark plugs in the Gen 1 1.4T engine.
 

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The Cruze doesn't like platinum plugs. Very few turbo charged cars like platinum. Copper works the best but has a short life. Iridium provides the longest life.
 
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