[77newell]

PIExpress: why do you want to know fuel consumption at idle? As Phil said, and I've been told by many DD mechanics, this particular engine tolerate long periods of idle. I have not asked nor received an explanation as to why it is worse for this style of engine versus 4 stroke cycle engines. I've just never needed to have long periods of idle with my coach. Having said all that years ago I drove a couple highway buses that used a high idle setting (8-900 rpm) for idling periods while the bus warmed or cooled in preparation for passengers.