I had a 87 D-150 for 12 years as my secondary/hunting vehicle. It didn't have posi so it was sort of worthless on ice or in deep snow but we got around. I think that had a 318 in it. When it was newer (I bought it with about 35K miles on it) it would get about 15 mpg on the highway. Sort of wish I had that old truck now but there were reasons why I got rid of it a decade ago. Selective memory now doesn't cut it...