Me and the neighbors that own the house behind me are splitting the cost of a fence. They insist on using their own contractor. The other contractors that I've talked to say they use 1-1/2 bags of concrete per 4x4 fence post. The guy my neighbors are insisting on hiring only uses a 1/2 bag per post. He says the reason for that is "because you want to disturb the least amount of soil as possible." He says if you use more concrete, then you have to dig a larger hole around the post. The larger the hole he says, the more loose soil you're gonna have around each post. So what he's doing is using a post hole digger and going down 2ft. He then pours the concrete dry around the post and packs it in - then adds water. I don't buy it. I'm thinking the more concrete the better. What are your thoughts?