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Driven DT-40. Very high zinc. The flat-6's like it. Guys who race $150k 911 cup cars like it. Guys who build $150k 911 cup cars like it. NESR will tell you it is unnecessary because it costs more than $20 a gallon.
Look, there's probably plenty of guys on NESR who know what they are talking about, and have a wide ranging experience. But most of the guys on here think their experience with 2 or 3 SV650s, Hawks, an odd GSX-R or two, and maybe a couple of two stroke dirt bikes gives them all the knowledge they need to know. It's them that make for entertaining viewing.