| Duncan writes: My daily driver is a 2013 Hyundai Genesis 5.0 R-Spec (with about 22,000 miles), making a claimed 429 hp on premium gas (91 octane, I assume). The power dips to 421 hp (claimed) when running on regular. Here in Iowa, we have the luxury of purchasing fuel with no ethanol. The 87 octane […] The post Piston Slap: Corny Fuel Talk from Iowa? appeared first on The Truth About Cars.
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