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Message: <blockquote data-quote="astroboy" data-source="post: 331840" data-attributes="member: 4527">So the blue is a dye, then can anyone provide info on what is the difference between blue Shell and the yellow Shell, apart from the color and price? and how to benefit from the "premium" fuel? Some say less than 2 years car no effect because engine is clean but old car will immediately benefit from it through the cleansing process and engine become more efficient..I know all these are trade secret and many on my friends that's from the industry refuse to comment further.Shell is claiming to get more mileage from their fuel and on the other hand, they are sponsoring public announcement to educate drivers not to speed unnecessarily to gain FC... see the link there..</blockquote>