Question about 1995 Cadillac Eldorado

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I changed the idle speed control motor and gave it a tuneup but i am only getting 11 mpg. what can I do to help out my MPG problem?

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These cars are natural gas guzzlers. I recommend making sure the coolant/ water mixture is according to spec's as well as the thermostat. These two items control the engine temperature and this is what the ECU uses to increase fuel trim if engine is cold
or decrease fuel trim if engine is warm.
Also keep Mass Air Flow Sensor clean (it has an air temperature sensor in it)
Timely oil and air filter changes will also help .
Make sure tires are in good condition and properly inflated.
A lot of people complain about the drag while driving on highway with windows open.

Posted on Apr 28, 2010

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