Finally Gas mileage improvement on SE. - 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 04-26-2004, 10:43 AM   #1
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Default Finally Gas mileage improvement on SE.

Though I would share what I found recently.
Couldn't get better mileage than 15 around town for a long time no matter what I did.
With gas going up every week
Recently I pulled out all all stops and it improved to 17 - 18 mpg.
Heres what I recently did.
1) Took out Delco platinums, installedBosch platinum plugs (I know some don't like them but I had them in stock).
2) Added 1 pint trick shift fluid to tranny.
3) Unhooked neg. Batt terminal for 35 min. to reset the PCM and all sensors.
There is a noticeable improvement in the way the car starts, picks up, and shifts.
I'm hoping that as the PCM relearns and it gets warmer out mileage will improve
to 19 - 20 MPG around town.
Can't complain though , I think resetting the PCM did the most. Didn't know it took more than 30 min. till I read it here in a post.
What do you think?
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Old 04-26-2004, 07:34 PM   #2
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Sounds good to me. Take it up on I-95, or another high speed road for an hour to get a good test run on it as an mpg check. Highway mpg'* to me are the true test imo. You should get close to 25-27 mpg highway.
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Old 04-26-2004, 07:35 PM   #3
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cool
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Old 04-26-2004, 07:51 PM   #4
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Default I-95

Thanks I'll try 95. Maybe a trip to the beach outlet shopping.
Highway mileage was allways ok though (around 27 - 2 in lockup.
I suspected I was getting some slip around town thats why I added the trick shift.
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