Thread: ECT's too low for mpg's? (Engine Coolant Temperature)
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Old 01-09-2015, 04:14 PM   #2 (permalink)
2000mc
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Join Date: Oct 2008
Location: Lawrence, KS
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Saturn-sold - '99 saturn sc1
Team Saturn
90 day: 28.28 mpg (US)

Yukon - '03 GMC Yukon Denali
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Quote:
Originally Posted by CAPTAIN CHAOS View Post
Anybody ever seen such low, but totally stable, operating temps?
Yes, replace your thermostat. When I started driving my saturn I was getting tanks around 37mpg. with a scanner I saw my coolant temp reading 153 usually. With a new tstat I would see 184-186, running the same route and speed, I then was getting around 40mpg.
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