Ever wonder how much gas and what grade of gas is still in the hose when we gas up our tiny gas tanks? Some of the hoses are very very long and I'm wondering where is the shut off valve in the hose. Is it at the handle or way back at the end of the hose or even inside the pump somewhere? How much fuel do those hoses hold anyway? For those wanting hi octane fuel from a pump with only one hose, how much hi octane are you getting if the previous user bought regular grade?