I found this searching around ?
Diesel Stage 3 MPG-MAX Boost Cooler
New from Snow Performance is the only system proven to increase fuel economy in all load states – empty or while towing. Special mapping and the most sophisticated 2d digital controller available result in 1-3 MPG increases! The MPG-MAX™ system does not require a sustained high load state in order to provide maximum fuel economy gains. The MPG-MAX™ system uses a new injection management controller that allows for a small, steady spray of water/methanol to be injected across the entire power curve – even while in cruise. This provides an increase in combustion efficiency which provides more power without injecting more diesel fuel. This increase in efficiency translates into an increase in fuel economy. Typical fuel economy increases are 10%-15% or 1-3 MPG.
The MPG-MAX™ system has a secondary output that is used to activate a Power Mode. The more sophisticated microprocessor introduces a independently mapped second stage of injection. Larger nozzles are used to inject more fluid to make more power. The Power Mode activation point is adjustable for best performance. The net effect is smooth power in all engine load states with no combustion quench resulting in a true turn-on-and-forget system.
It also now has a brighter LCD screen that displays boost, EGTs, and injection pump output. This means a savings of $200-$300 in gauges you don’t have to buy.
• Will not adversely affect particulate matter filter like most other power adders
• Doesn’t leave a “signature” on vehicles computer so warranty isn’t jeopardized
• Comes complete with large 7 gal. reservoir for a truly complete system
• The most advanced system on the market – true 2d mapping and 2 nozzles controlled independently for smooth power – always
• The only system proven to improve fuel economy
• Provides better fuel economy (1-3 MPG), more power (70-100 HP), and lower EGTs (200°-300° F)
• Dash mounted module – displays real time – no need for gauges
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