1992 SSE...14.5mpg city and 24.8mpg highway? - 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 11-10-2003, 09:50 AM   #1
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Default 1992 SSE...14.5mpg city and 24.8mpg highway?

I recently had a tune-up done...wires, plugs ..air and gas filter. Why does my car get lousy city mileage and good highway mileage? Car runs fine...smooth idle ...good pickup, trans shifts fine.
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Old 11-10-2003, 01:32 PM   #2
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I think it'* a simple matter of the driving style you're forced into on the Island. Probably nothing more. I think your car was originally rated at 18 city. You also have some miles on that thing by now, too.
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Old 11-10-2003, 04:23 PM   #3
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i get like 18 highway like 13 city
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Old 11-11-2003, 11:36 PM   #4
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just did a short 200 mile trip at 85mph avg last weekend and got 30mpg on my 96 with 121k on it
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Old 11-14-2003, 02:57 AM   #5
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17-20 city 26-29 hwy
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Old 11-14-2003, 04:09 PM   #6
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A series 1 blown car has a 2500 stall converter, that'* why the bad in town mileage. The Series 1 doesn't make any torque below ~1700-1800 rpm.
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Old 11-14-2003, 07:55 PM   #7
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Default Re: 1992 SSE...14.5mpg city and 24.8mpg highway?

Quote:
Originally Posted by tonyg
I recently had a tune-up done...wires, plugs ..air and gas filter. Why does my car get lousy city mileage and good highway mileage? Car runs fine...smooth idle ...good pickup, trans shifts fine.
Has the O2 sensor ever been replaced? Tire Pressure at least 32 PSI? Those two things could add a couple more mpg'*. Not that this is gonna help but did they check/replace your pcv valve when you had your car tuned up?
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Old 12-22-2003, 10:32 AM   #8
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It was the thermostat...it'* too cold for a 180 right now. I put the 195 back in and now I'm getting 17.5 mpg. I will put the 180 back in when it warms up here again.
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Old 12-22-2003, 03:28 PM   #9
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I challenge you to put it back in again. You'll see no difference. This has been discussed time and again. A 15 difference in your Thermostat rating will not have an effect on mileage, unless there is something else wrong with your car.

I'd bet that your awareness of the problem alone is helping your mileage. You may also be in the early stages of the 'burnt valve' syndrome that plagues the 92 SE and SSE. The colder weather may HELP your mileage in that condition.
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Old 12-22-2003, 04:30 PM   #10
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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.
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