Cook with 307 1.6 lpg: ((

Friends, I have a 2002 model peugeot 307 1.6 engine lpg vehicle ... it has been two weeks but it burns lpg very much. (sports) air filter was installed and it was 240 km lit out of the city lit lpg liter price (2.64 opet)
If you install the original air filter, it is said that the fuel will decrease even more and I changed it and I did not touch it, I burned the waste after the 32o crs burned between the cities I went to the gas setting and the gas was too low, he said and adjusted it, and he still fell from 320 cities between cities, the last exaggerated and burned 370 krs per km.
I went to the new waste today, this time it was quite short to the gas setting and I changed his filter. I looked at the spark plugs and it still doesn't burn less than 300 cents in km outside of the city. lpg liter price opette 2.84 ...
What should I do, friends? s Do?

If you measure in liters, you will get healthier information.

Burned 11 liters of gas at 80 km, isn't it very complicated?

under normal conditions, you should burn around 100 km 10,5 lt. your rate is a bit high

So what's the reason? Does anyone knows?

I change the lpg filters I think