My LPG system (Prins) takes 2 mins from cold to kick in. When warm the gas system takes .5 secs to kick in when the engine is turned on. Thing is a hybrid engine is turning on and off all the time ie when braking or when stopped and I cant help but think that that isn't going to be good for the engine or gas system - petrol one second, gas the next, then off, then back to petrol then gas etc etc.