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I drove a dual fuel (Petrol / LPG) van for years and unfortunately, less power and higher fuel consumption are normal for this type of conversion. Lower fuel costs still make it worthwhile though.
I only used engine on coasting with mine due to it's auto gearbox. However, engine off coasting may have been a problem anyway because of the delay in starting with the setup I had.
Mine would start straight away on petrol, but the LPG only turned on after engine vacuum was detected, so the engine needed to be cranked longer.
If you're lucky, your more modern system may not have this issue?
Pete.
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