As a beginner, tech-freak and masch.bauer, I finally ask for a rollover calculation: Like one of the 500 he – freaks, because convert to my 280 he, I can easily myself; question: 1) With these high-volume motors you have how much km range with LPG ? 2) volume of bottles = ………, at ……bar; this is an energy content of = ………. kWh or in kJ; [The unit you have ready]; 3) I have a lot of space in 280 SL not in the small trunk! Are there shorter bottles that fit in and what approximate range or even kWh energy content do the smaller ones have ? Conversions I can if necessary myself, or does the TÜV require a workshop – certification? 4) The advantages that I imagine: gas does not make any exhaust fumes for inner cities; this should result in Euro 4 or 5; help: a 1900 kg car (280 SL) thus needs about 15 liters of super petrol / 100km; i.e. 180 kWh; How much kWh contains a typical LPG – Bottle? Answer: ……….; Right? McRoad