As I too understand, CNG has not been very success with Xeta (for whatsoever reasons). Even the Xeta CNG introduced by the Company subsequently (CNG retrofitment tie-up with some Company) did not do well. Notwithstanding this, CNG retrofitment in Xeta is quite popular in Surat & around - probably because CNG is very popular there & Xeta otherwise being very spacious/comfortable small segment car.
Not only on CNG, Xeta even otherwise has that overheating problem - especially the older models.
Regarding LPG... running cost will not be as cheap as CNG but the power loss will be felt less - 10-15% against 20-25% on CNG. The power loss (LPG/CNG) however, differs depending upon Car, Kit, Retrofitment/workmanship quality, Maintenance etc.
Go for original Italian Kit - RTO approved (approvals are car/model specific). LPG Kit may cost in the range of 18-22K while CNG 35-45K.
Hope Vidhur is able to post further/finer details (I only have a general know-how).
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