GP gas mileage - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Oldsmobile When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 05-04-2006, 02:04 PM   #1
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2005
Location: Niagara Falls Ontario Canada
Posts: 1,121
Thanks: 0
Thanked 0 Times in 0 Posts
brianj is on a distinguished road
Default GP gas mileage

My Wife'* 99 GP (na 3.8L) has the crapiest gas mileage I've seen from a 3.8L. She'* filling her car with $20 ever 2 days! Where should I start to try and improve her mileage. Car has 100,000 miles on it, no mods, and just regular maint oil changes so far.
brianj is offline   Reply With Quote
Old 05-04-2006, 02:40 PM   #2
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Crappy milage?

What milage is it getting?

I am doing 24-25 in mixed driving with my old 95 Bonnie Series II 3800

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 05-04-2006, 03:44 PM   #3
Senior Member
Posts like a Camaro
 
looong4's Avatar
 
Join Date: Dec 2002
Location: Holly, Michigan
Posts: 1,181
Thanks: 0
Thanked 0 Times in 0 Posts
looong4 is on a distinguished road
Default

same here, my g/fs is a 00 gt. It sux big time. 104,xxx.
looong4 is offline   Reply With Quote
Old 05-04-2006, 03:50 PM   #4
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Thanks: 0
Thanked 0 Times in 0 Posts
dbtk2 is on a distinguished road
Default

Have you guys figured out what the actual mileage is? It might just seem like its crappy, when really their actually driving a lot of miles.

And $20 every 2 days is still only like 6 gallons every 2 days. 100 miles in the city would easily do that.

My GT gets around 19-21 around town and ~28 on the freeway. Thats with 207,700 miles.

But if the cars have 100k on them and haven't had any sort of tune-up, that definately wouldn't be a bad idea. Plugs, wires, 02 sensor would definately be a start.
dbtk2 is offline   Reply With Quote
Old 05-04-2006, 03:52 PM   #5
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Twin Falls, Idaho
Posts: 7,545
Thanks: 0
Thanked 1 Time in 1 Post
Hans is on a distinguished road
Default

they get 32mpg on the highway usually if cruise is at 80 and no stopping/passing.


28 is more normal with usual highway driving if you live near a city.

21 in the city or worse. they seem to be within 1mpg of other 3800 cars like bonnevilles and olds/buicks
Hans is offline   Reply With Quote
Old 05-05-2006, 07:43 PM   #6
Senior Member
Posts like a Supercharger
 
Join Date: Mar 2006
Location: Chicago
Posts: 193
Thanks: 0
Thanked 0 Times in 0 Posts
BlownBuick is on a distinguished road
Default

You should probably calculate the actual fuel mileage she'* getting so you'll have an actual value for gas mileage, not just x amount of dollars every y days. It'* very easy to think you get bad gas mileage when you never actually fill the car up and calculate gas mileage. One of my friends is like that with his 96 Bonneville SE. He'll but $10-$20 of gas at a time, then complains he gets bad gas mileage when he has to fill it again in a few days. He always compares his car to my other friend'* car (a blown LSS) and says, "I used a querter tank going to you house, and his gas gauge didn't even move!" He, however, went fron 1/4 tank to empty, as opposed to having the gauge on full, like my friend with the blown car.

Gas mileage is also heavily dependant on driving style. If she'* the "throttle on - throittle off" lots of throttle-coast-lots of throttle-coast type of person, no car she drives is going to get good gas mileage.

If she drives where she'll accelerate heavily up hills to maintain speed, then break heavily down the hill to maintain speed, she'* going to get bad gas mileage. If she accelerates hard away from stop lights only to stop quickly for the next light, she'll get bad gas mileage.

I don't know if you ever ride in her car when she drives, but you should try it to see how she drives to make sure the problems isn't with her, it'* with the car.
BlownBuick is offline   Reply With Quote
Old 05-05-2006, 11:55 PM   #7
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Thanks: 0
Thanked 0 Times in 0 Posts
dbtk2 is on a distinguished road
Default

Quote:
Originally Posted by Hans
they get 32mpg on the highway usually if cruise is at 80 and no stopping/passing.


28 is more normal with usual highway driving if you live near a city.

21 in the city or worse. they seem to be within 1mpg of other 3800 cars like bonnevilles and olds/buicks
GP GT'* don't seem to get that great of mileage on the freeway since they have 3.29 gears. You can get that kind of mileage at 60, but not at 80. Most members on club gp will tell you that their mileage drops significantly at speeds over ~75mph. From what I've seen, at 80 normal mileage is around 26-28mpg or so.

Id be amazed if my GT got 32mpg at 80.
dbtk2 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Gas, Oil And Gas Mileage **** SERIES II ENGINES**** Nashville Cowboy General GM Chat 26 02-06-2007 06:23 PM
gas mileage durbancic General GM Chat 6 04-05-2004 06:28 AM
low gas mileage? Greg 1992-1999 10 01-12-2004 10:27 PM
Bad gas mileage G2SSEi95 1992-1999 12 11-01-2002 02:46 AM
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 08:14 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.