I put mine in a spare 25L container and then top them up at the fuel station so it's ready just to pour in...but I always pre fill my tank before topping up to make sure the mix is right, ie 10L of meth and then brim the tank with fuel(50L tank), My containers have 5L of meth & 20L of Vpower so it works out nice for me...all depending on your mix % I'd do the same as you do t need the hassle of doing it at track IMO...just splash and dash