Hi Sanjib One of my friends has installed a LPG kit in his Zen(old model, not estilo). And as he says in 15 ltrs he runs his zen for about 300km. This comes out to be little more than Rs. 1.5/km. Now if that is the case in zen, I think even in the worst case your XETA would go rounds in not more than Rs. 2.5/km 'in the worst case'. For an average well maintained, well driven car Rs. 2/km is very much possible. And please feel free to revert back. I will me more than happy if i can be of any good help to you.
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