My 3.0L auto is still using 13.5-14L/100km on LPG in the city and it uses 10.5-11L/100km on Petrol.

With both tanks full, I have a range of about 1000km.

However, I mainly use LPG. Runs as good as; if not better than Petrol

I also have quiet a somewhat heavy foot. If its just me in the car, i give it a bit, with passengers, grandpaish