Strafer
That would make sense. Ice forms most readily in the low pressure boundary around a radii facing the airflow. The evidence also indicates that the smaller the radii the more readily the ice forms. That is why ice often forms on aerials more quickly and the deposit is greater that on the wing for example. The fuel cap of course has exactly this type of radii relative to the air flow.
Interestingly that also makes one wonder whether Wannabe's instructor was ever correct in the first place. I would guess the radii of the wheels is greater than the wing or at least no less?
Another myth maybe?? Doenst aviation seem so full of them. I often wonder why??