There is no engine noise or vibration on the Etios Petrol, we have driven it and you can check our Etios review to clear any doubts. The Etios is the best value for money car that you can get in the 5-8lakh price range, go for it.
lpg kits are approved via govt of india. UNITAX is best bec its cheaper kit and isi approved only cost 9000rs from 900cc to 1500cc vahicals + 2500rs extra for government approval on your RC.
u can install lpg kit in any patrol car.
etios is just a entry level sedan in Australia ppl do lpg conversation on almost every high end cars like ford falcon holden commodor toyota camery etc. bec lpg is cheaper.
and 100% taxis run on lpg I had a toyota Rav4 fitted with Lpg converson kit.
Both Toyota Etios and Swift Dzire are good options, while the Etios has space, Swift certainly has a powerful engine, better interiors and after sales services. The Dzire also enjoys better resale value.