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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 08-13-2003, 11:15 PM   #1
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I have had Lucy (94 SE) for about 3 years and 40,000 Miles now. She is at a grand total of 85,000. When I first got her I could push it a little and get 360 miles off a tank, Normally 340 - 350. This is mostly Highway/Interstate driving... She is basically my work car and we have about a 17-mile trip across the interstate to work. Right now we are down to an average of 280-290 Miles per tank. I plan to try some of the STP Fuel System Cleaner, but other than that, and barring a tune-up I can't really afford does anyone have any suggestions to goose my mileage a little? I will freely admit that I drive a LITTLE lead footed, averaging 65 Mph on the Highway and 75 Mph on the interstate. I guess I could get my Lazy A$$ out of bed earlier enough to not have to push it but that would be a lot harder I am curious what other people get in the way of mileage, and whether what I am getting is close to "the norm" or not. I am really enjoying the forums and learning a lot and have so many things I want to try when I get the time and or money
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Old 08-13-2003, 11:25 PM   #2
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I believe it'* time for you to replace your O2 sensor. Also a complete tune-up(plugs, air filter, gas filter, pcv) couldn't hurt. I would also change the trans fluid at this time too if it hasn't been done in awhile. You should be back to 360 miles/tank in no time!!! Others can offer their suggestions too.
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Old 08-13-2003, 11:32 PM   #3
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I have a similar trip and get 320-340 miles to a tank with 103800 miles on my 95 SE I use premium only no lower than 91 octane in her, and that was before any upgrades or the recent tune up.

Oh I also drive between 65 and 85mph depending on traffic (I fallow now learned the hard way not to lead) Actually on a trip to the WisDells I got 411 miles on a tank and the check gauge light had not come on yet.
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Old 08-13-2003, 11:32 PM   #4
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Complete tune up and new 02 sensor like was already mentioned, and open up the air intake some if at all possible, and the exhaust too. A smoother, cleaner, more efficient running engine is going to get better gas mileage, so if the engine can breathe easier it will get better gas mileage.
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Old 08-13-2003, 11:33 PM   #5
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Oh I almost forgot check your air filter thats a fairly inexpensive tune up that can restore gas millage.
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Old 08-13-2003, 11:35 PM   #6
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now being cheap as I have mentioned (not so much cheap as broke) would it be better to get an drop in K&N and gut the airbox or really try to convince myself and the wife I need a nice shiny new intake?
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Old 08-13-2003, 11:39 PM   #7
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now being cheap as I have mentioned (not so much cheap as broke) would it be better to get an drop in K&N and gut the airbox or really try to convince myself and the wife I need a nice shiny new intake?
That depends on what kind of intake you get. If you get a filter that is exposed to the engine bay at all it isn't going to help at all. A drop in K&N and a gutted airbox is very effective, otherwise you will need a cold air box that is insulated and sealed off from hot underhood air.
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