Other than being green there is little financial gain from using these branded products. If the 5% gain in fuel mileage was valid that will give you another 1.25 mpg and that won't cover the bill on a quart of these products with the current fuel prices. If you look at the MSDS's for some of these products that active ingredient is usually methane or alcohol that's is what is pushing the cetane up. It's like selling bottled tap water - it's packaged conveniently for the end user.

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