Mitsubishi typically are very reliable impart because they use old technology. I used to own a 07 Outlander. In that model the 3rd row was painful to use.
For SUV's I'd would look at a Kia Sorento as well. It is a much better model than the Outlander.
However if you want best fuel economy consider minivans. If 6 seats will work the Mazda5 is a great option. Otherwise look for a Dodge Grand Caravan.