Today i blocked off the lower grill with 1" pipe insulation,i left about 3" space on the right side to get some airflow to the radiator,temps were in the upper 70's to lower 80.Final mpg was 43.5 as i parked my car in front my house,similar trip earlier with no grill gave me 38.3MPG.coolant temp stayed in the normal range at highway speeds(60mph) around 180-190 but it went up to around 203 when sitting at a traffic light,i had the fun running at cool but no a/c.
