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Diesel engines tend to respond quite well to supplemental water injection, and eventually worth to consider a simultaneous usage with propane, to mitigate its tendency to knock. On a sidenote, last Saturday I saw a Mercedes-Benz truck fitted with supplemental CNG injection, which is becoming more widespread in my country (Brazil) recently, and since it has better anti-knock properties than ethanol it suits well to the lean-burn in a Diesel engine. And even though some CNG fumigation might decrease the Oxygen concentration at the combustion chambers much like an EGR does, it's better than EGR as the CNG increases the flame spread for a more accurate burn of the Diesel fuel, not only generating fewer soot but also extracting a higher amount of energy from a given volume of Diesel fuel or even if it's partially replaced by the CNG to retain stock power and torque figures.
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