This is not available as factory fitting.
However you can check for after market fittings if they can do something.
Drawback can be:
- Aesthetically is may not look good and rather awkward
- Cylinder will be in boot space all the times
- Waiting times for refuelling.
- Possibly lower pick up speed
- Possibly delayed startups
- 1.4 GLX engine from the outset not designed for CNG
- You may be the first logan 1.4 GLX owner with such arrangement that this forum might come across