I wanna buy petrol ventoand put up CNG. But, is it efficient/milage and reliable like Maruti and Hyundai engines ? Wht's the Arrival time of New generation Hyundai Verna?

I wanna buy petrol ventoand put up CNG. But, is it efficient/milage and reliable like Maruti and Hyundai engines ? Wht’s the Arrival time of New generation Hyundai Verna ?

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