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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 02-04-2007, 01:19 AM   #11
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Okay- I have 2 Denso O2 sensors, Autolite plugs and wires. Jeff moved some of the wires around and cleaned the MAF recently. I hadn't gone through a full tank of gas at the time but when I filled up my mileage was 21.28 mpg. I will know more when I fill up again this weekend. Hopefully that is all that it is. IF not, I will be sure to ask for more opinions.

Thanks guys!!!!
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Old 02-04-2007, 05:35 PM   #12
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14 is really bad gas mileage, I usually get around 20-22 in town and about 26-28 on the highway, and i drive pretty hard.
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Old 02-06-2007, 03:08 PM   #13
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I checked mileage last night and got 24 mpg. Last week was only 21. So hopefully it will continue to increase or at least stay in the 24 range. I travel approximately 230 miles a week on the highway and about 80 miles a week in town.

Last night Jeff put some stuff called Lucas gas treatment that is supposed to clean injectors, fuel system, etc.

Hopefully it will help.
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Old 02-06-2007, 11:51 PM   #14
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One way to help keep things in the top end of your engine clean and improve gas mileage is to use "Top Tier" gasolines. This is a link to a TSB on it.

Top Tier

For our Canadian members...

Top Tier Canada
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