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So getting 10 mph less under the same circumstances but 2 years & or 20,000 miles later is "normal." I cannot believe that the cooling system...
Don't know if you saw my reply but it was not a "city" drive. And the measurement was after removing the radiator cap. The block temp was 108 F....
The 20-minute drive was at an average of around 50 mph from my home in the country to town. I did take a block temp that was 108F and the radiator...
July of 2017, I had the dealer replace the coolant control valve and water pump on my 08 Prius. Code T1121 was satisfied but summer-time mpg was...