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Cool engine vs gas consumption

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Old Jan 31, 2022 | 03:31 PM
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Cool engine vs gas consumption

Does an open thermostat increase gas consumption?
It's cool in Minnesota now and temp gauge barely moves above "C". Passenger compartment is warm enough to get by. I have no problem with that. Typically mileage is 18 to 21 MPG. Now I barely getting 17 MPG. Therein is my question.
Bob P.
2001 ranger / V6 / 4-Liter
 
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Old Jan 31, 2022 | 10:28 PM
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Winter gas blends(more ethanol) typically result in a loss of milage, but added to that are longer warmup times and thicker powertrain lubricants which produce more drag and also reduce milage. A winter grill cover can help the motor warm up faster and maintain that heat especially when doing a lot of highway driving. When I had a 4cyl Ranger a winter grill cover was manditory or the motor would loose all heat and even the in-cab heat would go away when driving on the highway. I made a rad cover for one of them, it was just a piece of 1/8" ply painted black that covered 2/3 of the rad and was held in place with a couple brackets.
 
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Old Feb 1, 2022 | 07:36 AM
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Originally Posted by rgp
...open thermostat increase gas consumption?
...temp gauge barely moves above "C"
...Typically mileage is 18 to 21 MPG. Now I barely getting 17 MPG
...2001 ranger / V6 / 4-Liter
Stuck open ThermoStat causes engine to never fully warmup, that in turn cause PCM to enrich Fuel/Air mix,
that in turn causes bad gas mileage & eventually damages CatCons as they run too hot burning up excess fuel.
For this V6~4.0L~SOHC engine, stock factory ThermoStat is rated 192f 89c.
Tried various ThermoStats, found ratings of 180f or less are unstable = Temp bouncing up\down.
Ended up with a 183f 84c ThermoStat, that keeps engine slightly cooler at 183~185f.
Click here for more info.
 
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