Gungadin, I live in Ks. where we have extreme changes in temps within the course of one day. I have an Autolite 2100 on a clifford adaptor on my 250 and found that the snorkle aircleaner and heat stove were necessary to prevent icing....I follow duece coupes advice and remove the tube in the summer and remove and plug the vacuum hose to the trap door in the aircleaner....I ran a cold air duct to the radiator core support area for a while but did not see any real improvement in mileage....outside air temps can be 100+ in the summer so maybe there was not enough difference between ambient and underhood temps......fats
