Lousy fuel mileage on my 93 sse non sc - Page 2 - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 07-26-2006, 10:15 AM   #11
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default Re: Lousy fuel mileage on my 93 sse non sc

Quote:
Originally Posted by dluttmer
Hey ya'll. My question is .. gas mileage. I get around 20-22 mpg in my bonny. I have always ran 93 octane in it. Will running higher octane give me less mpg? I have approx. 144k on the car. Plugs, wires have been changed. Will the O2 sensor make a difference? Or is the mpg about right for this model?.. Thanks..
Quick octane lesson: higher octane has less energy in it. It is used to add horsepower by adding timing and increasing cylinder pressure.

Using premium in an engine with a PCM that can't really adjust for it, like ours, can/will reduce mileage. Age can increase the octane need through hot spots that develop from carbon or sharp edges that form... but I say you give regular a chance. Do a few tankfulls at least.
J Wikoff is offline   Reply With Quote
Old 07-26-2006, 10:20 AM   #12
Senior Member
Certified Car Nut
 
Join Date: Jul 2003
Location: Robbinsdale, MN
Posts: 15,408
Thanks: 0
Thanked 0 Times in 0 Posts
MOS95B is on a distinguished road
Default Re: Lousy fuel mileage on my 93 sse non sc

Quote:
Originally Posted by J Wikoff
Quote:
Originally Posted by dluttmer
Hey ya'll. My question is .. gas mileage. I get around 20-22 mpg in my bonny. I have always ran 93 octane in it. Will running higher octane give me less mpg? I have approx. 144k on the car. Plugs, wires have been changed. Will the O2 sensor make a difference? Or is the mpg about right for this model?.. Thanks..
Quick octane lesson: higher octane has less energy in it. It is used to add horsepower by adding timing and increasing cylinder pressure.

Using premium in an engine with a PCM that can't really adjust for it, like ours, can/will reduce mileage. Age can increase the octane need through hot spots that develop from carbon or sharp edges that form... but I say you give regular a chance. Do a few tankfulls at least.
Well, that explains why i always seem to get less mileage on higher octanes...
MOS95B is offline   Reply With Quote
Old 07-26-2006, 11:11 AM   #13
Junior Member
 
Join Date: Jun 2006
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville93 is on a distinguished road
Default Re: Lousy fuel mileage on my 93 sse non sc

Quote:
Originally Posted by dluttmer
Hey ya'll. My question is .. gas mileage. I get around 20-22 mpg in my bonny. I have always ran 93 octane in it. Will running higher octane give me less mpg? I have approx. 144k on the car. Plugs, wires have been changed. Will the O2 sensor make a difference? Or is the mpg about right for this model?.. Thanks..
I have a 1993 Bonneville SSE with 195,000 miles...... always use regular gas, and always get 20 mpg
Bonneville93 is offline   Reply With Quote
Old 07-26-2006, 12:39 PM   #14
Member
Posts like a V-Tak
 
Join Date: Jul 2006
Location: Colorado Springs, CO
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
goertz is on a distinguished road
Default Re: Lousy fuel mileage on my 93 sse non sc

Quote:
Originally Posted by markwb
Quote:
Originally Posted by dluttmer
Will the O2 sensor make a difference? Or is the mpg about right for this model?.. Thanks..
A new O2 sensor will probably help you out. I assume the 20-22 mpg is combined city/hwy? You should be able to get close to 27-28 mpg highway with your car. The 20-22 doesn't sound too bad to me especially if you're running A/C all the time and it is a combinedestimate.
My 20 mpg is a combo of highway/city, A/C ALWAYS on, and sometimes watching the boost gage jump, so I guess I'm normal. I'm taking it on a trip to Vegas Friday night, so we'll see how she does with complete highway driving.
goertz is offline   Reply With Quote
Old 07-26-2006, 12:48 PM   #15
Senior Member
Posts like a Northstar
 
Join Date: Jan 2002
Location: southern California
Posts: 538
Thanks: 0
Thanked 0 Times in 0 Posts
billha is on a distinguished road
Default Re: Lousy fuel mileage on my 93 sse non sc

I agree with this comment, and so do others, including professional race car drivers - using high octane gas in a normally aspirated engine designed for regular unleaded gas is a waste of money.

Quote:
Originally Posted by dluttmer
Quick octane lesson: higher octane has less energy in it. It is used to add horsepower by adding timing and increasing cylinder pressure.
Using premium in an engine with a PCM that can't really adjust for it, like ours, can/will reduce mileage. Age can increase the octane need through hot spots that develop from carbon or sharp edges that form... but I say you give regular a chance. Do a few tankfulls at least.
billha is offline   Reply With Quote
Old 07-26-2006, 03:40 PM   #16
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

I have pulled 30+ no matter what fuel I use in my 95... I pulled a 33 coming through WV and had ran 93 oct for 1100 miles...

But yes its true there is less burnable fuel with 93.. I run 87 99.99% of the time in all of my cars... And both the 91 LE and 95 SE will pull better than 30 mpg on the road

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 07-26-2006, 04:11 PM   #17
Senior Member
Certified Car Nut
 
Join Date: Jul 2003
Location: Robbinsdale, MN
Posts: 15,408
Thanks: 0
Thanked 0 Times in 0 Posts
MOS95B is on a distinguished road
Default

I get up to about 26MPG, mixed now that it'* warm. But, I just changed my O2 recently, switched to full synth oil, and did a tune up. Also, I almost never use the AC. I prefer the feel of the windows down and the music up.
MOS95B is offline   Reply With Quote
Old 07-27-2006, 01:33 AM   #18
Senior Member
Posts like a 4 Banger
 
Join Date: Jul 2006
Location: Campbellville, Ontario (Close to Toronto)
Posts: 103
Thanks: 0
Thanked 0 Times in 0 Posts
ForcedInductionPhool is on a distinguished road
Default

With my 94 SSEI I get an average of aobut 23-25 MPG out of her. Thats alot more city than highway as well.

Erik
ForcedInductionPhool is offline   Reply With Quote
Old 07-27-2006, 01:31 PM   #19
Senior Member
Certified GM nut
 
Join Date: Feb 2004
Location: CT
Posts: 2,099
Thanks: 0
Thanked 1 Time in 1 Post
SSEBONNE4EVA is on a distinguished road
Default mpg

23-25 city is exceptional. The states that require the10% ethanol blended fuels, like ours caused people to get 2-3 mpg less. My friend regularly gets 27mpg in his intrepid. He took a trip to PA, filled up there and got 31 on the way home. Just shows you what different fuel blends can do to mileage.
Can't get close to 18 around town with ethanol.
SSEBONNE4EVA is offline   Reply With Quote
Old 07-27-2006, 08:51 PM   #20
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Grand Rapids, Mi
Posts: 3,244
Thanks: 0
Thanked 0 Times in 0 Posts
L27Buick is on a distinguished road
Default

wow! how do u guys get the 33 on the freeway i cant break 27. that driving to detroit at 75-80 for 2 hours. in the city i avg 19 with a medium foot.
L27Buick is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Why camels make lousy pets...... brianj Lounge 4 08-22-2007 08:34 AM
Lousy trunk design? Jhiim 2000-2005 13 05-06-2005 09:51 AM
My 91 Bonneville SSE Non SC Tirell Performance, Brainstorming & Tuning 1 04-29-2003 08:01 PM
1991 Bonneville SSE Non SC Tirell Performance, Brainstorming & Tuning 12 04-16-2003 11:18 PM
Lousy Focus Sol General GM Chat 12 10-04-2002 09:28 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:09 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.