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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Actually, a 5% increase in fuel economy will save me almost $0.94 every time I fill the tank.

Calculations based on: 23.5 mpg base milage (average recorded milage over the last 3000 miles)

with a 5% increase = 1.175 mpg (or 24.675 mpg total)

average cost of D2 over the last 3000 miles = $2.91 per gallon

I averaged 332 miles between fill ups (over the last 3000).

When I use DK, I add 12 oz DK at every fill up at a cost of $1.25. (I bought a 96 oz jug of DK at Wal-Mart for 11.96).

So:

A 5% increase in milage saves me 0.673 gallons of D2 at each fill up (13.455 gal vs 14.128 gal), plus adding 12 oz of DK replaces 0.078 gallons of D2. That equals $2.18 worth of D2 saved for every $1.25 worth of DK spent.

Now, lets turn the calculation around. How much of a mpg increase do I need to see before using DK is no more expensive than not using it?

First 12 oz of DK, replaces $0.227 worth of D2.

Therefore, adding 12 oz of DK only increases the cost of a fill up by $1.023.

At 23.5 mpg, I use 14.1276 gallons of fuel at every fill up (332 miles).

To make up the added cost of DK, I need to use 0.3516 gallons less D2 over 332 miles.

This means I need to get 24.1 mpg, or a 2.6% increase in fuel economy.

Provided that the product does no harm, you have very little to lose (or gain) by using it.