Keep the pump running longer. Higher temperatures speed the reaction. Lower temperatures take longer. Run that puppy overnight and you will be fine. You could also do the 3/27 test on it every once in a while to see when it is done.

Wait, you said four gallons. Shake it longer. I assume you are shaking it instead of using a pump.

You could also draw a really hot bath and put the jug in the hot bath to heat up the mixture. Good chance you will be sucking methanol fumes as they escape from the jug. Better to just shake it longer.

Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.