Any of you guys winterizing with air only?

I don't think what one person does has much relevance to what someone else does. Every rv is different. Depends where you live. Here in Ontario, it can be minus 20 and lower for weeks on end. As others have stated, I used to use only air, until one year I froze my toilet valve. I fixed it, and bought a different rv that year. Trying to get all the water out was near impossible. I could see the pump still had water at it, in spite of many attempts with the air. I gave in, and ran pink through the lines until I could only see pink at the pump. I have used air and pink ever since. I don't drink the water in the tanks anyway, but it only takes a couple of tank flushes till I don't notice it anymore. To each their own. Spending ten bucks on rv antifreeze is a lot cheaper than tearing open a wall to find a split pipe. Its all good until it isn't. Cheers.