I think the logic behind pipes and methane storage tanks is a bit off… Storage tanks don’t store methane unless you link it with pipes. It does not receive by road (Why not?). And as soon as you link it, the efficiency drops…
So what this is saying is, don’t use the storage tanks because you will pay for that.
Then the second issue I have with pipes is, as soon as you link a pipe to the drill it will no longer deliver to other buildings via road that needs Methane.
So if you don’t want to use the road system you cannot store methane, and if you want to store methane, you cannot use roads… 
