Gas 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 07-19-2007, 10:11 AM   #11
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im getting better millage in my 88 sse.. its giving me about 350-400 miles per tank now as opposed to my 95 only giving me about an average of 250 miles per tank? any ideas/
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Old 07-19-2007, 10:28 AM   #12
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First suggestion...stop trying to compare "tanks" and calculate the actual mileage. If the gauge is off and on one car your 300-400 miles is 17 gallons versus the 250 miles being 13 gallons..that can be almost the same mileage when calculated.
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Old 07-19-2007, 11:53 AM   #13
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It'* been my experience that when you're dealing with vehicles that are up to 14 years old, they need complete service and or replacement of certain fuel system parts. Now I've only been driving my SE for a few days now, but when it came to my 93 Lincoln Mark VIII, I was getting 16mpg. Roughly 200 miles per tank. I did a complete fuel system change. I replace the fuel filter, fuel pump and fuel pressure regulator together. I also took out my fuel injectors, cleaned and replaced the orings. After I did this, my Mark shot up to 25mpg on the highway and 20mpg in the city.
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Old 07-19-2007, 11:56 AM   #14
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20 city / 25.5 highway. I have no idea how that works out
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Old 07-19-2007, 12:50 PM   #15
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[quote]Posted: Thu Jul 19, 2007 8:11 am Post subject:

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im getting better millage in my 88 sse.[quote]


don't try to get the same mileage than a Ln3 whit a L36 i had 2 LN3 and they where the besst 3800 for mileage
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Old 07-19-2007, 01:43 PM   #16
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It is nice to swap all the fuel system items...although it would be costly. Having worked with a mechanic for years now, I've adopted the philosophy of testing if possible and only replacing the worn, broken or maintenance parts to keep costs down.
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Old 07-19-2007, 04:24 PM   #17
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Quote:
Originally Posted by wjcollier07
Was getting an avg of 17 with my Bosch oxygen sensor, now getting an avg of 24 mpg with my Denso. a HUGE 70.8% increase! This is about 35% city, 65% highway.
That is a hellova jump in mileage. I found me one on SparkPlugs.com. $36.75 + $8 shipping. Sure beats $58.99 at AutoZone !!!
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Old 07-21-2007, 02:59 PM   #18
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I was just watching Motorweek, and Pat Goss was talking about fuel economy and what could cause bad fuel economy. Most of this we know already. They are:

1. Check tire pressure regularly. Set to specifications set inside the door.
2. Clean fuel filter
3. Good spark plugs
4. Inlet air temperture sensor.
5. Mass Airflow Sensor (And not to look for codes, because they can be out of spec without setting codes)
6. Bad Coolant tempertaure sensor
7. Bad Thermostat (Makes the car run too cool, or makes the computer think the car is running cooler than it should.
8. Thicker oil is not always good
9. Bad battery (Which makes the alternator charge more, consuming more power)
10. And all the junk in the trunk
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Old 07-21-2007, 03:07 PM   #19
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Quote:
9. Bad battery (Which makes the alternator charge more, consuming more power)
QFT !!

In my F150 you can even see the difference when running the hvac fan on high with no ac...
you start measuring by blocks per tankfull when you have the ac on max and the fan on high! LOL

I've never noticed the same thng in the Olds, to me it seems like it get better mpg with the ac on.
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Old 07-21-2007, 05:02 PM   #20
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The AC compressors these days don't drag the engines down a lot... As they require less HP to turn than they used to..

Even on my L36 with the car loaded own and the AC cranking away I pulled 28-32 depending on where I was... But I pulled 29mpg running through Virginia, A piece of WV, Maryland, New York, PA and CT...

I feel I have done great on 3.06 gears with the L36...

The best Mileage I pulled ever with my L36 was 33 Mpg On a very cool day in WV coming back to FL

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