The best replacement for cng is lng.

The best alternatives to cng are rated as following:
★★★★★  lng
★★★★  lpg
★★★★  gasoline
★★  petrol
★  lpg which is better
★  gasoline mpg
★  diesel which is better
★  petrol car
  gas mpg
  lpg car
  petrol which is best
  lpg cars
  lpg which is safe
  lpg vehicles
  ngv
  lpg which is safer
  e85
  petrol cars
  compressed natural gas
  lpg mileage

Your alternative for cng is not listed? Suggest!
Speaking about cng, one probably shouldn't forget about diesel engine.

Other search terms related to cng and their ratings are:
★★★★★ diesel engine
★★★★ diesel
★★ swift
★ hho
★ ford figo
lpg
You have in mind a companion for cng and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cng in all years. Click on graph for more.
cng
lng
lpg