Suggestions on how to improve fuel mileage? - Page 3 - 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 02-25-2008, 01:02 PM   #21
Member
Posts like a V-Tak
 
Join Date: Nov 2007
Location: Philadelphia, PA
Posts: 47
Thanks: 0
Thanked 0 Times in 0 Posts
Tuffguy610 is on a distinguished road
Default

Its funny I started a thread about this a few months ago when I got my car with the new engine in it. My car was TERRIBLE on gas, and still is as far as I'm concerned. If an LS1 Camaro gets better gas mileage than it and has 2 liters more displacement and its romped on alot, something is still wrong with my car. I went through the works like everybody has told you to do on here. I did the fuel filter, which started a fuel leak in the pressure line when I disturbed the quick disconnects while messing with it (now fixed), bought a Denso O2 sensor from Rock Auto for $40 shipped, flushed my trans fluid to increase the reliability and efficiency of my transmission, gutted my airbox, increased air pressure in my tires, and IM STILL GETTING 14 MPG WITH 25-50% HIGHWAY. I don't beat on my car at all, I have my Camaro for driving fast. I happen to be a valet parking coordinator for a few restaurants, so I stumble across my share of L36 equipped H-bodies that have the Gas Mileage analyzer buttons on the dash. I check every car that I can, and I see most H-body Park Avenues, Bonnevilles, and Le Sabres getting low 20s on the display, and I do see my share of 14-16 mpgs on the display of these cars as well. I guess I am going to chalk it up to the fact that my car just sucks on gas. I am going to replace my air filter, but I won't expect that to shoot me up to 20+ mpgs. I just can't believe some people rave about the gas mileage in these cars. Good luck with your problem because I hear gas is gonna hit $4/gal this summer.
Tuffguy610 is offline   Reply With Quote
Old 02-25-2008, 01:06 PM   #22
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Most cars here hit 28-32 mpg on the freeway.

I suggest you do a compression test or attend a meet soon if yours doesn't improve. The team approach may work better.
willwren is offline   Reply With Quote
Old 02-25-2008, 06:17 PM   #23
Senior Member
Posts like a 4 Banger
 
Join Date: Nov 2004
Location: bloomington, in
Posts: 122
Thanks: 0
Thanked 1 Time in 1 Post
bobc997615 is on a distinguished road
Default

Are you using a 195 thermostat or a 160?

195 for gas mileage...I get 27-28 highway, 217K miles on the clock
bobc997615 is offline   Reply With Quote
Old 02-25-2008, 07:05 PM   #24
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2008
Location: INDIANAPOLIS, IN 46237
Posts: 38
Thanks: 0
Thanked 0 Times in 0 Posts
mustangman_93 is on a distinguished road
Default

Using a 195 t-stat and I just ordered a denso O2 sensor from rockauto, this is the recommended one, correct? Thanks Bryan
mustangman_93 is offline   Reply With Quote
Old 02-25-2008, 11:52 PM   #25
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

AC Delco is preferred. Denso is probably ok, but not proven by any kind of margin.
willwren is offline   Reply With Quote
Old 02-26-2008, 10:11 AM   #26
Member
Posts like a V-Tak
 
Join Date: Nov 2007
Location: Philadelphia, PA
Posts: 47
Thanks: 0
Thanked 0 Times in 0 Posts
Tuffguy610 is on a distinguished road
Default

Mustang Man,
You are probably talkin about the one that I bought. I don't really have problems with it, its a nice unit. I probably should have mentioned that there is a code from this website that you can put in the promotional box when ordering from rock auto. This code gives you a 5% discount on most parts, it saved me $2 from the purchase. Sorry, I didnt think you were that serious on buying a denso from rock auto.
Tuffguy610 is offline   Reply With Quote
Old 02-26-2008, 11:31 AM   #27
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

You could also check the TPS voltage at the idle position with a voltmeter.
They are sometimes not exact and could use tweaking. I know they are plug and play but you could file alittle of the holes to get slight movement.
I tweaked my 96 SE and it improved the shift points and MPG'*.
SSEBONNE4EVA is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Seven ways to improve the Winter Olympics MOS95B Lounge 1 02-24-2006 12:44 PM
400 mile road trip in 93 Olds 88, can I improve gas mileage? dbtk2 1992-1999 15 08-20-2004 12:06 AM
What mods will improve my gas mileage? Jrios 2000-2005 29 01-08-2003 08:25 PM
What can I do to improve my gas mileage? Blk_Bonneville 1987-1991 10 08-25-2002 12:15 PM


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 09:47 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.