On a barbecue tour, there is no such thing as down time. Even the long drives bring surprises. Last year, returning to Dallas from East Texas, we decided that someone should call out Texas Monthly for including joints that use gas-fired pits in its Top 50 BBQ rankings. We did just that, eventually engaging TM food editor Pat Sharpe in a constructive discussion about the magazine's selection criteria. Sometimes, we just learn interesting things about our fellow Posse members. On the first leg of our recent 35-hour, 700-mile dash to the Gulf Coast and back, Posse co-founder Chris Wilkins talked…