Some users have reported entering lean burn easier with MMO. If so, it could provide a greater increase than for other vehicles, but I would want to see testing. Project Farm compared it to Seafoam:
MMO seemed to clean better, but reduced compression. Now, the piston travels a set distance, while carbon can shrink the chamber, so I guess that compression tests are not the most important factor.
Shouty says that it is great for soaking parts, but not for adding to your gas:
Of course, Shouty does not like Seafoam either:
He says that you should use something like Chevron's Techron (or fill up at Chevron). He did say that MMO worked in old cars and I believe that yours qualifies. It does not have the newfangled technologies that he said are incompatible.