Sorry for my late entry into this discussion . Overall in this thread Cultus is supposed to be the winner but there are some very important points to consider.
First of all, true comparison can be made only by the one who has owned all the cars. Fortunately, I own both Mirage & Cultus and both are on my daily commute so i can have very meaningful comparison between these two.
First of All, Cultus is the clear winner in Resale and Parts/Maintenance Availability. Having a number of dealerships and local assembling, Parts and maintenance is not an issue.
Regarding Fuel efficiency, I'm a bit confused as to which car is more fuel efficient Mirage or Cultus. On idling and traffic jams, Slow moving, Cultus wins but on Long routes like motorways, Mirage gives better figures. Overall, you can say only +/- 5 % difference between fuel efficiency.
Major difference lies in the build quality. Believe me, there is no comparison between Mirage and Cultus in terms of Functions and Build quality.. If Cultus is 6/10, Mirage is 10/10. I've never owned Passo so tbh i don't know much about Passo but i don't like it's shape and interior but it's only my own preference. Regarding fuel efficiency and Functions, Mirage is better than Passo.