Yes, total wood use was just about 1/2 cup - I found it plenty for this roast. I used a small piece of maple about 1"x2" at the start and put a couple of charcoal briquets in the wood pan with it. The rest were hickory and mesquite chips and it really took just a couple every half hour to keep it going - its too cold to watch for anything but steam coming out the top but I keep sniffing at the vent to see if I needed more.
At about 3 hours I'd added one more briquet and that was it as I foiled at 5 hours. The briquets gave the extra zing of nitrogen oxides to get a little smoke ring in there