Honestly...how good was the 318...mpg / durability / hp

A few years back I had an old ram pickup with the 318. The body eventually fell apart ( Canadian winters ), so it got scrapped, but it still ran great. It was driven to the wrecking yard with 600,000 km on it. The engine had never been apart. I was very stringent with regular oil changes, and I'm sure that played a big part in its longevity. I would buy Mopar oil filters by the case and always use synthetic oil, premium fuel and a tune up every fall. That might seem like overkill, but I think it was definitely worth it!
Wow thats crazy what year was your truck ? 2 or 4bbl 318 ?