Re: OT-Unexplained Mileage Increase

Posted by ASEguy on August 28, 2010 at 09:18:37 from (204.184.80.25):

In Reply to: OT-Unexplained Mileage Increase posted by farmer boy on August 28, 2010 at 05:45:41:

Never trust a gauge. Verify with a thermometer. Fuel mileage will drop off with a cool engine due to more fuel needed to achieve the combustion event. Kinda like trying to start a weedeater cold with the choke off. When your vehicle reaches closed loop (operating temp.) fuel control authority is given to the computer through the sensor input. After 1996 OBDII vehicles had codes for engine cold too long because it would increase emissions. Thermostats are responsible for achieving minimum operating temp. Hope that helps. Gerard

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