crappy gas mileage - 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 03-20-2007, 08:09 PM   #1
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im getting horrible gas mileage!! i filled up with 16 gallons and now at a lil more then a quarter tank ive only gone 130 miles??! i used to get 300 to tank, that was filling up with 17-18 tho. but its still really bad please help
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Old 03-20-2007, 08:38 PM   #2
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What exact changes have you made to the engine in the past few weeks that could affect this?
Is your 02 Sensor old at all?
Does the exhaust smell really rich even when the car is warmed right up?
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Old 03-20-2007, 09:11 PM   #3
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What is your year and model? Do you live up north? During the winter months my gas mileage is only 15-19mpg but from spring to fall its around 20-24mpg. I think "winter gas" is only a northern states deal. Add the winter gas and cold temps and you got a good combo for bad mileage.
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Old 03-20-2007, 09:14 PM   #4
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Quote:
Originally Posted by fantastic88
What is your year and model? Do you live up north? During the winter months my gas mileage is only 15-19mpg but from spring to fall its around 20-24mpg. I think "winter gas" is only a northern states deal. Add the winter gas and cold temps and you got a good combo for bad mileage.
he'* right. I've only gotten 13-16 during the winter. Winter gas plus low tire pressure plus other winter related crap does take a major toll on your mileage so wait until the temperatures stablize unlike this stupid Ohio (we had four seasons in one week..)
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Old 03-20-2007, 09:28 PM   #5
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Quote:
(we had four seasons in one week..)
Tell me about it last week its almost 70, last night it got down to 19. Now tomarrow its going to be 60. Looks like its staying this time.
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Old 03-20-2007, 10:26 PM   #6
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I agree with the others. I get pretty crappy mileage in the winter. I get about 240 miles on 16 gallons in the winter. I get a touch over 300 during the spring/fall. Hot summers drop it a bit again from running the A/C 24/7.
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Old 03-20-2007, 10:31 PM   #7
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Is this a general rant or a request for help?
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Old 03-20-2007, 11:11 PM   #8
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there is a weird smell sometimes that comes out of my vents but idk what it is, and its only sometimes. and im not sure when the o2 sensor was changed last? The weather is crazy, it was almost 70 last week then snowed the other day. i guess ill get some gas cleaner stuff and put it in that seems to help out my friends
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Old 03-20-2007, 11:52 PM   #9
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Quote:
Originally Posted by vital49
Is this a general rant or a request for help?
Quote:
Originally Posted by jhill52788
but its still really bad please help
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Old 03-21-2007, 09:49 AM   #10
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Based on your previous posts, your car is a 92-99. Moving to that forum.

Please add your year and trim level to your signature.
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