They're handy and keep their equipment in good shape. The phone is 247-5891. Hitting a gas line could ruin more than just your day. The permit is good for several months, so you don't need to wait until the last minute to get it. A basic knowledge of the code requirements, which the compliance people can help provide.
Flow seems about the same or slightly better.
I'll measure it soon and report back. Can't help you much here, as I should think every project will vary. You'll want to minimize the elbows as they can reduce flow, I think. You'll also need something to cut the pipe with, whether it be copper or pvc. You'll find detailed pictures and instructions for the project here .