just preheat it matt and run it around gently gradually giving it more and more throttle as you get through a few tanks..and I get 12m40 out of mine with a 7mm insert,ceramics and a real heavy throttle finger.with a 6.5 or 6mm insert and some gentler driving I could probably break 15minutes.

And I was going to keep mine for racing and use the MM5 7 port I had just finished running 2 gallon through for bashing and club days but the MG66 is so easy and fun to drive fast I think the 7 port is gonna be gathering dust till I sell it... almost certainly to buy a spare MG66.