two cars in our family, a khyber 2000 and an Alto 2012 are converted on LPG for the past 2 - 3 years.
So far, both the cars are running fine. Giving 18+ in city and 25-28 on long route.
However, last winter, what i noticed in Khyber was that at cold night time, it failed to cross 100 km/h speed on M2, i asked the owner and he said he has reduced lpg pressure something like that and at cold nights on high speeds the kit inside the engine kind of freezes and reduces supply hence lower speed.
but the Alto owner did not experience or complain such a thing.
however, keep in mind both are tiny 1000cc engines and are carburetor ones..
There was a cultus also, the 3 cylinder one, there on the LPG shop to fill gas and he said his car is also running fine on uber / careem