I ran my carbeurettor cultus on LPG for a long time by using cng cylinder with lpg Irani kit.
The experience was rather smooth.
Engine was peppy no decrease in acceleration with/without Ac.
It used to return me 220/230 km per 10 kg of gas with 50% AC in Lahore city. Pretty economical as compared to petrol. And 24/7 availability when back in the day getting CNG was a headache.
I would say go for it.