Yesterday I was investigating my shit fuel economy and noticed that my coolant temps would not go over 160. That temp was after 2 different 50 mile trips. Is this normal or are the t-stats bad? Outside air temp was 25-35.
Plus extended startup idle times also ruin fuel mileage. Question: how does one test the winter coolant protection level on these trucks? Just test out of the coolant bottle or out of the air bleed off screw?