I have never spilled more fuel than when the new design came out. And SLOW. Yeah, go ahead and try to fill two 12 gallon tanks on the back of a pontoon boat. 20 min later and two sore arms and a sore back will get you there.
Now I just remove the whole spout and pour into a funnel.
No SLOW is something I can sympathize with
How about you guys use a real can?? Plenty to choose from...not all are created equal and a reason why these cost $$
http://www.northernsafety.com/Search?q=gas+can