For those of us running 3%.....
5oz Stainless Sliver Jerry Can Hip Flask Liquor Whisky Pocket Bottle + Funnel
Just got  few of these from China via ebay,makes a handy 2 stroke oil reserve back up supply.
Although nominally rated at 5 fluid oz my ones actually take 148ml which is 2ml shy of true 3%
5 UK oz = 142.065 ml, which if mixed with 5 litres = 2.84% ratio.
If this 5 litres of petrol + 142.065mL is added to existing quantity of petroil in tank the final ratio gets closer to 3%.   
Alternatively, could be used for original purpose ?
			
		
 if you are 1/2% out either way it's unlikely to cause any issues in terms of lubrication although too little oil will make it a bit rich (more petrol) and too muck oil will make it leaner. A small 2t measuring jug has worked for me, sometimes I spill some and it doesn't all go in but has never caused a problem.
  if you are 1/2% out either way it's unlikely to cause any issues in terms of lubrication although too little oil will make it a bit rich (more petrol) and too muck oil will make it leaner. A small 2t measuring jug has worked for me, sometimes I spill some and it doesn't all go in but has never caused a problem.