Originally Posted by ButtBurner
I agree with you on lump burning faster but your consumption rate got my interest
What kind of cooker do you have? and how big of bags are you using?
The RO was used with my old Char-broil offset that as since been donated to a friend of a Brethren to get him started into the smoking world. It was modified with the typical mods; gasket, tuning plates, sheet metal baffle, grate level exhaust, two temp gauges on both ends at grate level, etc.
For a 5 or 6 hour cook, I would cruise through two bags of RO (8.8lb bag) easy. Maybe it was just the quality of RO or the lower density of lump but with briquettes I would use an entire bag of stubb's (15lb bag) charcoal plus chunks IF I was fighting the temps, which did happen from time to time.
So if you go by weight alone, I was consistently using more (~18lbs) lump from RO than using about a single 15lb bag of briquettes. 3lbs may not seem like much of a difference for one cook but over the span of 4 cooks, that's a difference of about ~12lbs. Over the course of a summer where one cooks almost every weekend, that can add up pretty quick.
The only reason I stuck with the lump instead of going completely to briquettes was the ash factor. Lump was a lot easier to clean up than the briquettes were and the briquettes would tend to choke down the fire as the ash would build up under the fire grate. Nothing a simple sweep underneath wouldn't help, but still annoying none the less.
Now, all I use is Stubb's in my UDS, PBC, and Coleman bullet since ash build up is less of a factor. For grilling in the kettles, I use whatever I can find on sale or is cheaper than the rest.