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her in OZ i believe quite a few people are adding lpg irrigation.
the diesel is leaned off and supplimented with a small amount of propane gas to the intake manifold,resulting in both cheaper and better fuel ecconomy.
i believe part of the reason for this is that the propane burns happily right up to the cylinder walls ,wher diesel suffers from the cooling effect of cylinder walls and does not combust completle right next to them
also the heat generated by the burning propane in this visinity causes the accompaning diesel to combust fully.
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