The Maruti Suzuki XL6 is a good MPV with a spacious rear row of seats and offers very good value. Being a Maruti Suzuki car, you will also be able to service it pretty much anywhere, and the car will be reliable too. Other options in this MPV segment would be the Kia Carens Clavis. It would be more pricey than the XL6 but comes across as a more premium offering with a better interior and a very good third row too. If you are looking for a CNG again, the Clavis does not have that option, in which case the XL6 would best suit your requirements.