Simply put, during shorter runs and cooler weather, the oil/engine temperature doesn't get hot enough to prevent mayo development, and reduces fuel economy.
The former was never really an issue for myself, as I often used other methods to get the engine hot quickly in cooler weather, like blocking the air inlet to the oil cooler, and I never rode short distances. Since embiggening the engine, I've found the 1400 runs cooler than the 1200. It was frustrating my attempts to properly map the engine. Now, not only does the engine get up to "proper" operating temperature more quickly, it remains stable.