gas milage per tank - 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 11-26-2005, 02:49 AM   #1
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Default gas milage per tank

im posting another post here to help me with my gas milage issue...i've heard and read (fuelmilage.gov) that my cars suppost to get around 20 mpg...i've got an 18 gallon tank and am getting around 200-220 per tank..the cars been sitting 6 months--and i put new plugs and wires on---and the front o2 sensor before the cat...but anyways---i've got a 95' bonneville ssei---anybody else wif this car or motor...if you can tell me what to do to make my milage better--or how many miles your getting per full tank of gas...that'd help me out---thanks.
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Old 11-26-2005, 03:02 AM   #2
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Many of our cars here (including supercharged) can hang around 30 mpg on the freeway with the cruise set on a long trip.

Mixed driving can't be compared due to different driving conditions and styles.

Best you can do is a full tune-up and live with what you get.

Plugs
Wires
O2
PCV
Fuel filter
air filter
Lube/Oil/Filter

And flow-matched fuel injectors could help as well.

Trans slippage as it ages also affects you. Consider having the filter replaced and getting it flushed.
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Old 11-26-2005, 03:03 AM   #3
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The only way to tell what you're true mileage is...Fill it.. drive 200 miles.. refill...divide miles by gallons.

Once you do that come back and let us know... we can suggest better from there.
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Old 11-26-2005, 03:09 AM   #4
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Quote:
Originally Posted by BillBoost37
The only way to tell what you're true mileage is...Fill it.. drive 200 miles.. refill...divide miles by gallons.

Once you do that come back and let us know... we can suggest better from there.
did that once before...and i got about 200-210 with 1/4 tank left..(i dont go below 1/4 tank)...now im doing it again with new plugs, wires, and just put a new 02 sensor in and i've got 113...and used just over 1/4 tank according to the guage...but i'll let the guage go to 1/4 tank left....fill up----and let you guys know the numbers when i get there....thanks for the help im getting.
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Old 11-26-2005, 03:19 AM   #5
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the gas gague in these cars are only a reference.....dont fully trust the gagues espically after half
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Old 11-26-2005, 03:32 AM   #6
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Quote:
Originally Posted by 1993 SLE
the gas gague in these cars are only a reference.....dont fully trust the gagues espically after half
As an example..
My 95 will have 4-6 gallons at 1/4 tank
My 97 has maybe 2 gallons at 1/4 tank

You must crunch numbers. If you don't.. you don't actually know how you are doing.
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Old 11-26-2005, 12:03 PM   #7
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yup im not a Bonneville and mine is even worse, when im sitting on empty and the light is on telling me i need gas, the absolute most i have ever put in is a tad over 13 gallons, and i have a 17 gallon tank. and the light had been on for a long time when i did that. so use that trip meter and see how much you put in..you might be surprised by the results.
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Old 11-26-2005, 12:29 PM   #8
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Quote:
when im sitting on empty and the light is on telling me i need gas, the absolute most i have ever put in is a tad over 13 gallons, and i have a 17 gallon tank.
It'* because the gas tank is oddly shaped. It'* an "L" with the vertical part of the "L" the thickest part.

As to gas mileage, my car has consistently gotten 20 MPG from the day it rolled from the factory, and it doesn't much matter what kind of driving-freeway at 80, around town, never varies much.

I did make a 200-mile drive recently and made it a point to use the cruise control, which I normally don't, and it got almost 22.

I was amazed. I've thought about changing the 02 sensor, as many here recommend, especially at 124K, but since the mileage has never varied....why?
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Old 11-26-2005, 12:45 PM   #9
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Default I used to get about 22 around town

I just sold my '95 SSEi, but I'd get around 21 to 22 around town in daily driving. A straight highway trip would probably yield 25 to 27 mpg.

If you need shop manuals, check out these practically new ones on eBay:

http://cgi.ebay.com/ebaymotors/ws/eB...tem=8018102002
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Old 11-26-2005, 12:56 PM   #10
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Quote:
Originally Posted by Bob Dillon
I did make a 200-mile drive recently and made it a point to use the cruise control, which I normally don't, and it got almost 22.

I was amazed. I've thought about changing the 02 sensor, as many here recommend, especially at 124K, but since the mileage has never varied....why?
Why? Because you should be at LEAST over 25mpg on a trip like that, possibly pushing 30.
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