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Thinking I may have a stuck open thermostat also. Takes at least 8 miles at about 40'F to get coolant to 90'C and during that time, if I stop at a traffic light, temperature will start to decrease.
Seems like coolant temp should ramp up consistently until t-stat opens; not surge up/down during heat-up.
Overall highway mileage is good at about 45 mpg, but is in 30's until fully warmed up
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