1992 SSE...14.5mpg city and 24.8mpg highway? - 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 12-22-2003, 05:05 PM   #11
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With very little "aggressive driving" 10mpg city, mostly short trips on very cold days and 25mpg highway
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Old 12-22-2003, 05:30 PM   #12
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I average 17.5 to 19 City, and I have not driven the highway, yet, due to a new engine. We will see...............

Your thermostat should not make that big of a difference on power unless the car is just getting too hot. The temperature of the air coming in, though, would makea difference. That is kind of weird if you car made a big power change
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Old 12-22-2003, 05:50 PM   #13
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Originally Posted by tonyg
I understand what you are saying but my mileage went from 230 a tank full to 280 (local driving) after putting the 195 back in. Coincidence? Perhaps. Anyway what'* the percentage of the 92'* that will suffer from burnt valves? All of them? In the summer with the 195 in the car the car ran at 220 degrees....too hot in my opinion. But now that winter is here the car runs at just under 200 degrees with the 195 therm. With the 180 and colder weather the car was barely reaching 180. I'm only going by what my trip meter is telling me when I gas up.
You're egr-less. It'* only a matter of time, but the 180 will help delay the inevitable. You may already have the problem. Have a compression check done. If wet and dry are about equal, it'* the valves.
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