the dieselpage link is to Diesel Injection Services, and they're running a Christmas special right now. By ordering "just enough" to make the next incentive level, I got the price of the Lubricity formula down to just a hair over $0. 03 per gallon treated. If you go for the Performance Formula, it raises it to a whopping $0. 08, but even a 3% mpg gain and you'd break even. At these prices, considering the cost of an injection pump, I'm not sure anyone can justify NOT using treatment!