Like
@Infinitejest said, I didn’t necessarily notice anything different than any other break-in. I mean, you always have that point a day or whatever into the break-in, when you can feel a saw pick-up, free-up, etc.
The first 500 I had at the beginning of this thread ran very rich from the start. The one I currently have ran from the get-go how I expect a good tune to be for the most part. I should add that my first 500 has been to the shop for a bunch of electrical issues. I dunno, just a side-note.
As far as fuel economy, I am plenty happy with it. The guy cutting next to me is running a 461, cutting at a similar pace in the same timber type, and we have similar fuel mileage. Although the 500 is definitely faster than his 461. But that’s another story.
It’s not a fuel sipper, but I would say it is fuel-efficient if that makes any sense. I feel like it is cutting plenty of wood for the fuel being used.