Just finished a 350 mile trip towing my 24' car trailer loaded with race car and usual stuff. First trip with the new Aeroforce Interceptor gauge plugged in. I can sleep in peace again now. Ambient temps were in the 90's, Trans. temp peeked at 208F in stop and go traffic getting to the highway then settled down to 185F once cruising at 60-70mph. Coolant sat around 197-200F. Got 10.1mpg with a good tail wind on the way home which is a new record!

I'm pretty happy. Towing at the upper limit of the EL's capacity and the Ford Engineers seem to have the HD trans. cooler size sorted. Raced all weekend with my GM engineer buddy who's friend in Powertrain said if he sees temps in his Suburban around 250F to worry. GM and Ford co-developed the trans. in our trucks so I think 250F should be our new 'worry yardstick'.