Have you considered propane injection? I am doing this to my truck. I should have it running sometime next week, depending when MSD ships my controller back.
The MSD/Superchips Digital Propane Injection claims up to a 75HP increase.
You can also run it on lower settings to improve mialage and range.
The system is not cheap, I have about $1,500 into it (DPI system, Tank, lines and fittings), but if it increases milage like they claim, it should pay for itself fairly quickly considering Diesel is $4.00+ per gallon now.
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