Depending on where you live, there may be race gas sold nearby. A couple gallons of 100-octane unleaded mixed into your tank full of 91 will completely cure any pinging. That's the route I took...
There's no premium in Cali!?
Wow...
Regular is about 1.08 here and premium ranges from 1.15 to 1.25 near me. Race gas is also 104 and sells for 3.99 gallon (Suddenly owning a high-compression hemi isn't a good idea)
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