I have a 100 Series on dual fuel, I am not sure of the economy on petrol but I am only achieving 25l per 100km on lpg around the metro area with some 80km cruising. I have a snorkel fitted to improve air flow, I recently read about the aftermarket air filters (the layers of sponge soaked in oil) causing problem, I am going to buy a Ryco paper element filter and see if there is any improvement. Can any one else suggest ways of improving the economy from "super heavy to just heavy consumption"! What are others getting from their LPG powered beasts?