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Lpg fumigation now is on my 98 dodge 2500 24v cummins 5sp. Before lpg, it regularly got 17 plus mpg and a best tank of 20.15 mpg. My tanks are true mixed driving with about 30 percent highway and the rest mountain dirt roads, sometimes with trailer always with tools and building materials. I don't want to report my mileage with lpg yet as I just hooked it up again after several years without. Burned up about half a tank so far and it looks like a good one based on odometer and fuel gauge, but you never know until the fill up.
Water/methanol is a common mod for these trucks. I'm still dialling in the lpg so won't mess with water yet.
My other work truck is going to be the true experimental platform. The 98 has an ecu that controls injection timing, fuel duration and a whole host of parameters that make it difficult to mod one aspect and pinpoint cause and effect. My 99 dodge is also a 24v cummins, but I recently put in a p7100 injection pump from the previous generation dodge. Injection timing is fixed but adjustable. The engine is entirely mechanical. I put arp head studs on to handle the extra cylinder pressure from the lpg. Right now I'm running about 3% lpg, but will slowly increase to about 15% or so. I'll start a thread when I have more to report on lpg.
Sorry about hijacking the thread.
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