Hey. I hope your friend pulls through. I come from a different walk of life, but at the same time I realize that this isn't the time to push forward my view on things. You're hurting. And for that I'm sorry.
Three hundred pounds sounds about right, depending on how many gallons you're getting. I'll talk to about it in a couple days, I'm moving and a lot of my time is going twards that right now. When I have some free time I'll tell you everything you need to know. Doing that on my phone would be a bitch, lol.