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The Cruze was by far the most affected by heat soak car I have ever owned.
I wish I had known this thing ran on premium gas and needed better plugs to run down here when I bought it. Starting to seem like I should have just kept dumping money into my Pontiac to keep it on the road.
It appears GM didn't figure out proper timing to get things decent for the Cruze on 87 until the 2014+ ECM tuning. The pre-2014 cars are definitely heavily affected by hot weather on 87 octane.
 
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