roundsounds, the Airvan is Lycoming powered and most certainly does call for Mixture ICO to start. This is the only properly Lycoming powered Aircraft I've flown though, had a couple here and there changed over so obviously the POH didn't reflect the different engine but I still start the Lycomings with ICO and Continentals with Mixture Rich and haven't encountered too many issues (At least none that I'd attribute to the engine rather than my own mistakes!).