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temperature sensitive mileage 200 1987

posted by  riverbend on  Wed Mar 3 07:01 CST 2010
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last visit: Wed Oct 22 15:29 CST 2014
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When the temperature is down around zero degrees F I get 22 mpg. Now that it has warmed up to the mid 30s, it is 25 mpg. When it gets back up to 50 I suspect that the mileage will go back to 27 mpg.

The difference is more than typical for winter vs summer gas, letting the car idle for a few minutes while chipping ice, etc. Any ideas on what could be so sensitive to temperature ?

The only fuel system component that I have replaced recently is the fuel Pressure regulator.

Thanks

Greg





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