Salam,
Mere pas grand sportage 2002 2.5 years se he. Is me toyota hilux surf ka engine he (Hilux Surf SSR 1994 model) it is 113 hp engine. But jab mene gari li thi to us me computer GLI ka fit tha and gari patrol pe boht bakwas chalti thi. Gas pe guzara tha but consumption ziada thi.
Then It took me around 1 year to fix the whole car, I got the manual from toyota japan for the car, done some electronics work like Oxygen sensor, TPS sensor, IAT sensor, MAF etc. Oxygen sensor k liye sinlensor me alteration krni pari, and IAT k liye air-cleaner me alteration ki he, done wiring of sensors, get orignial ECU of the Hilux Surf. Get the denso irridium plugs of correct heat range. Manual me se plug correct gap dekh kr adjust kia. Ignitor re-wire kia. Ab gari k computer me koi scan code nahi he. Fuel pump landcruiser ka dala he aur us k liye tank me tori alteration ki he and injectors replace kiye hn with toyotas new one.
Aur ab mashALLAH Gas pe mileage 5 Rs/Km he and Patrol 9/10 /L he in the city. Mene gari me multan tak travel kia he with 1 hour stop in Lahore. Hilux surf ka engine he and it is rock solid. Summer me AC pe kuch heat ka masla he(in City only), now I am considering to change the radiator. Murree and Kashmir travel kia he in snow and the engine pulls the car like a monster. Overall sportage is very good deal provided its price. Sportage ko load condition me CNG pe mat chalaen to koi kam nahi nikale gi. Is ki suspension ko ap car se compare nahi kr sakte, islye kam bhi kam nikalti he.
Surf me aur is me fark running cost ka he, agar kia sportage me alteration achi ho jai to SURF ise catch nahi kr sakti, more power and less fuel consumption. Surf luxurious jeep he aur is hawale se SURF ka Sportage se koi comparison nahi he. lekin SURF 20 Lack ki he and Sportage 9 Lack ki, You wont mind taking it to Saif-ul-Malook 
Umeed he ye information ap longon k liye help ful ho g.