should i switch to lpg now

friends, 2006 1.4 new safe 307 im is starting to burn much to me now it is burning in the city 400 (doing 250 km with 100 rubles) or so i don't know if it is normal but i think it is very burning. sometimes it can be 410. today i decided to have a tube. If the fuel is too low or 1.4 is lpg fitted to the vehicle. Is it going to decrease performance.

My 1.6 307 2003 model car travels 180-190 km with a 50tl tube, this figure with gasoline & nbsp; and it does not burn without any pressure etc.

these days, I think those who hesitate to pass should pass. It doesn't matter 1.4 or 1.2.