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I like Shell. Don't know about this nitro thing, however, my tribologist has always liked Shell and the premium is supposed to have nearly twice the add pack of it's closest top tier gas competitors. Don't know if fact. My Shell/CITI card has given me a 5% monthly rebate since 2004 and hence Shell is always the "least expensive" gas in town. I top up before half empty (various reasons), only use Shell, add either Fuel Power products (maybe over kill) and if all this is just snake-oil-B.S..... it makes me happy, my UOA's are nice (soluables 1-2 ppm), I get great mileage and my cars and cycle run just fine...YMMV...
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