What can I do to improve my gas mileage? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-31-1969, 08:00 PM   #1
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Can someone tell me the size of my gas tank? Is it 60 Litres? Thanks...Andru.
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Old 12-31-1969, 08:00 PM   #2
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Mine is 18 gallons. Yours is probably the same. It'* listed in your manual if you have one.
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Old 12-31-1969, 08:00 PM   #3
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No, I don't have a manual. It probly is around 60 litres or so. The only reason I'm want to know for sure is because whenever I fill up the gauge never goes to full. So I'm just wondering if it'* off a litte bit so that when I'm reading almost empty I might still have just under 1/4 tank. If memory serves me correct I can't remember putting more then 55 litres in at one time, not that I pay to much attention to that. Thanks...Andru.
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Old 12-31-1969, 08:00 PM   #4
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I'm getting about 300-325 miles out of a full tank. Seems kind of thirsty to me seeing as I do about 70/30 HWY driving. What are u guys getting to a tank? I have given the car a new set of plugs, air filter, made sure my tire pressure is good, and I don't carry any extra weight in the car. So I'm open to any thoughts u guys have...thanks...Andru.
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Old 12-31-1969, 08:00 PM   #5
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I get around 18mpg (something like 270 a tank) in mostly city driving. I have a good bit of a lead foot, too.

Try changing your oxygen sensor. Last summer my car was getting 15mpg and throwing up SES lights, replacing it solved all that. They're only $20 and easy to change so it can't hurt.
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Old 06-13-2002, 02:02 AM   #6
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Default That'* better...

Since I had to replace my motor I've been noticing that my gas milage is a bit better so I figured it out tonight. Before I was getting about 19.5 MPG and now I'm getting about 22MPG. By my calculations this new motor should pay for itself in JUST 6 years...man that'll be sweet hehe
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Old 07-22-2002, 12:20 AM   #7
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I got about just over 33 mpg on my last trip up north.

The highest I have mpg I ever got was 40.1 mpg on a 220 mile drive. It was a cool fall day and I did not need to run the AC and kept the car between 60 and 70 mph. I have never been able to duplicate it so it might be a fluke.
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Old 08-19-2002, 10:41 PM   #8
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Well I get 350KM on a car with 5.5 cylinders! My 92 SE has a 60L tank too.
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Old 08-19-2002, 11:49 PM   #9
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I’m lucky to get a block or two. LOL

Something about my foot…Wait I mean feet. LOL what an image.

TY
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Old 08-25-2002, 12:15 PM   #10
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You pretty much have to drive these cars on straightaways, with no stopping, or accelerate EXTREMELY slow to get good gas mileage. When I used to drive all highway driving in my LeSabre, I got about 22 MPG (very heavy foot, I floored it about 3 times a day. lol) NOW I drive a whole lot slower, almost like a Grandma (the car loves it though) and now I get about 29MPG. Brother'* 92 gets 31 MPG on the highway, mom'* 95 gets 32. (cruise control set at about 75)
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