Running premium is a waste of money. The V-10 and it's computer was made to run on good ole 87 octane. Anything else is useless.
Your spark knock may be due to a plug going bad or a coil-over-plug going bad.
Posssibly a sensor going bad.
35,000 miles on our 2012 Lexi V-10, and have always used 87 octane. Never a miss, never a hic-up.
Grumpy
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Steve & Cheryl + Zoey, and Ziggy, our furry kids.
2012 Forrest River Lexington 283ts
Toad, 2013 Subaru XV Crosstrek
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