I RECENTLY TOWED A 16' ENCLOSED STEEL TRAILER (full of antique motorcycles)FROM FLORIDA TO NEW ENGLAND,ONTO OHIO THEN BACK TO FLORIDA. was impressed how much torque it had going through the mountains,and pleasantly surprised that it gets better mileage in the mountains than on flat land towing the same trailer.seems the torque it produces allows it to calmly climb mountains with out screaming high rpm's. and then once topping the mountain it more or less coasts down resulting in over 18 mpg. towing on flat land its a 15 mpg limit. my question is transmission temperature at one point i was reading 218 degrees with or without tow haul on. at what temp should i be concerned? 218 degrees seems to me to be alot?