Hi Gary.
I cooked a package of bacon in it to get an early start on seasoning it when I first picked it up. Since then I have used it twice for ribs. Both times it ran a little hot but the 2nd rib cook was much better than the 1st one. I think I should have the temps dialed in no problem once I use it a few more times. Just need to gunk up the insides a bit more.
As for fuel consumption, I haven't really noticed much difference. I used the 18.5" charcoal ring for both rib cooks. I didn't feel the need to use the huge ring, seemed like a waste of charcoal. If I didn't have the smaller ring I would just put a few fire bricks inside the larger ring to help condense the charcoal capacity.
Overall I'm happy I have both sizes. I will use the 18.5" more overall but the 22.5" will be perfect during family gatherings as we like to host lots of parties during the summer. I was going to use 2 18.5" smokers for parties but using 1 bigger smoker would be more convenient and I would use less charcoal.