alto is a much better car than that mehran trash ( no offense to mehran owners out there)..its so uncomfortable that its not even funny. So yeah creative you made a wise choice by opting for the alto. as many people of stated, its a big benefit to get F/F CNG, but in your case i believe its not an option so go for the petrol alto, wait for the CNG kit prices to go down a bit and get it installed.best of luck, and hopefully you should get your new ride pretty soon