There are several guys on here that run triples. But they are not synonymous with better fuel mileage. Unless perhaps you use a progressive type linkage that only turns on the out riggers under heavy throttle conditions.

IMO a spreadbore 4-barrel carb with vacuum secondaries would be more efficient. And one heck of a lot easier to tune with many fewer parts.

Of course for looks the triples are really nice compared to a clunky spreadbore.

Kitz