Freaking Crap Stupid Winter Milage - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-13-2003, 10:09 AM   #11
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Old 02-13-2003, 04:17 PM   #12
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Sol, BOTH WillWren and compyelc4 are correct. You are due for a new O2 sensor (as am I), that is a portion of your bad fuel economy. But compyelc4 has a valid point too, although he failed to mention in greater detail what the snow does to mileage. Snow and ice cause you to drive much slower--sometimes around 35 mph. This is not the optimal speed for fuel efficiency in any condition, usually our Bonnevilles do better around 50-60 mph. Add to that the additional friction of driving on snow or slush (have you ever noticed how much harder it is to walk in sand at Lake Huron, Lake Michigan, or any of the other Great Lakes? Or how much harder it is to walk through deep snow? It is the same principle). Loss of traction is also a factor. Whether you want to or not, you will break traction on ice, snow, and slush. There is also a colder, denser air charge going through your intake plenum which requires more fuel to maintain a proper fuel to air ratio.

To sum up, winter means more power, less traction, and less fuel efficiency.

Change your O2 sensor but don't count on the same mileage you get in the spring/summer/fall.
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Old 02-13-2003, 06:29 PM   #13
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OK, thanks everyone. I'll let you know my results when I get the sensor.
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Old 02-13-2003, 10:36 PM   #14
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I just talked to my dad about it. The O2 has only about 15000 miles on it, so that shouldn't be the problem. I'll wait and see how it is when it gets a little warmer, then I'll jump to conclusions. It may just be the horrible cold weather making my ride work a little harder.
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Old 02-13-2003, 11:49 PM   #15
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I think I still have the factory one'* in there.
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