I'm right there with you Pappy. A Jambo is crazy efficient with fuel. I wish my Langs had insulated fire boxes. In fact I was just about to start a thread that asks if anyone did this type of Mod to there Lang.
My comparison was based more on pits that are not insulated. We compete with a Lang all the time and it is very tiring feeding it every half hour or so. This is the reason that I want to get my Spicewine mounted on a trailer so we can get some shut eye at contests.
Lang 84 Deluxe Warmer with Chargrill
XL - BGE
Med. BGE ( Bought it for my son Vincenzo)
Kenmore Elite Gasser
Camp Chef Outdoor Stove