hey doc i guess i cant really answer that about how much the 89 gets , i have never really checked it out but i can usually get anywheres from 400 to 500 miles on a tank , just depends how and where i go , it is set up for the 55 miles per hour as that is what it used to be when the truck was made and know doing 70/75 is sort of hard on it and plus being a 4x4 i usually do around 60/65 unless im in a hurry to get home from a hunting trip or something hehehe i have 362,000 miles on her and she still runs like a champ
