Southern Pride makes gas-fired commercial smokers, which burn a little wood for flavor, and offers cooking tips to its customers. For one of its larger machines, the XLR-1400, which has a capacity of 72 briskets, the recipe for "Texas style brisket" says cook 12 to 14 hours and use a total of two 4-inch by 12-inch logs. That's for a "heavy smoke" taste, the recipe says. A couple weeks ago, we got into a good discussion on this blog about real Texas barbecue and whether it could ever be cooked with gas. We still say no and offer Southern Pride's…