180 Thermostat - Learned Something! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-27-2003, 12:30 AM   #1
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Default 180 Thermostat - Learned Something!

For years I've been averaging 23-25 mpg around town. After reading all the posts about going with a cooler thermostat, I replaced my trusty old 195 degree with a 180. Car runs about the same, but my mileage has dropped off about 3 mpg. The same thing happened to my '95 vette when I went to a colder thermostat on that thing too.

I kinda figured there would be a trade-off on something. Now I know. Anyone else experience this? I know, I know, guys who want more power and put there foot in it anyway probably are not the least bit interested in mpg; like...who cares? Right?

Ted
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Old 10-27-2003, 12:58 AM   #2
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I didn't notice any difference in city or highway mileage after changing to 180. I normally only get 20 in town though.
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Old 10-27-2003, 02:12 AM   #3
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try switching it back, the general concensus here is that the 180 shouldnt do that. Are your O2 and other sensors good?
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Old 10-27-2003, 04:13 AM   #4
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No difference here, from 195 to 180 to drilled 180. I'm still getting nearly 30 on the highway.
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Old 10-27-2003, 11:38 AM   #5
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My mileage decreased when I installed the 180. I was getting 18mpg in town...now I'm getting 14.5mpg. Not good. I recently had new wires, plugs and fuel filter installed. Thinking I should change the 02 sensor. If mileage does not improve after that I may go back to a 195.
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Old 10-27-2003, 03:35 PM   #6
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Default question!

Would we see any difference in mileage with a drilled t stat as compared to a non drilled?
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Old 10-27-2003, 06:19 PM   #7
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Quote:
Originally Posted by tonyg
My mileage decreased when I installed the 180. I was getting 18mpg in town...now I'm getting 14.5mpg. Not good. I recently had new wires, plugs and fuel filter installed. Thinking I should change the 02 sensor. If mileage does not improve after that I may go back to a 195.
I would suspect the O2 as well. You should be getting better than 18 mpg with either Tstat.
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Old 10-27-2003, 09:08 PM   #8
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If I could drive without mashing the gas pedal so often I'd tell you what I've noticed.
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Old 10-27-2003, 11:23 PM   #9
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I installed a 180 thermostat and I have my fans running 24/7 and the only time my gas mileage sucked is when I somehow unplugged my air temp sensor in my airbox and didn't know it. Other than that I am getting 18 to 19 MPG city
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Old 10-28-2003, 01:47 PM   #10
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first of paul very ncie car....second...will how you get that much highway...i only get like 225 a tank thats like 13MPG
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