Try a 6.5 ltr diesel, I have one in an 80 series , I get 12.5ltrs per 100 ks towing a trailor with 250 + kgs in it. (got to do this for work)
So much low down power I am always the first one to leave the hard well worn tracks on the beach to let others stay on them cause it just doesnt matter.
Last trip to Cervantes was in the heat of the afternoon (about 40- 42c), I did something I never usually do and pushed real hard all the way , air-con on , overtook all, never got hot .
Tows a 6mtre boat fully loaded without being a slug , never last at the lights.
Cant wat to do the milage without towing , but its hard with work.
It has 260ltrs of diesel when full , havent been to the servo for 6 weeks!
Most dont believe the economy but, what the ...... Tis truely great