Bro, Have gone through all the posts, everyone shared their experiences, so I should give my advise as well.
So.............. go for a diesel car its cost efficient and cheap as compare to other variety available in market. Off course no resale value and early oil change.
I own a 2.0D Saloon which is giving me 17Km/Ltr in town and 20Km +/ltr on long with AC.
I am a frequent traveller between Attock - Hyderabad which is approx. 1260Kms and I do it all in one go, 16 - 17 hours with 3 stops of 15 minutes for tea, (Dilaywala near Mianwali, Chowk Bahadur near Rahim Yaar Khan and 3rd as per need).
Its up to you to finalize but the price difference between petrol and diesel per liter cost reaches to break even with good mileage.
You can get a good 2.0D Saloon (2002 - 2004) around 750,000 to 850,000
and second option is Nissan Sunny 1998 - 2002 (2.0D), Nissan is even more economical than corolla diesel.