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Next: 6.5 diesel coolant loss
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External
Since: May 08, 2005
Posts: 12
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(Msg. 1) Posted: Thu Jun 16, 2005 8:29 pm
Post subject: Poor gas mileage
Archived from groups: alt>autos>4x4>chevy-trucks (more info?)
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Hello,
I own a 98 GMC Sierra Z71 5.7 Vortec that seems to be getting really poor
mileage. I previously owned a 97 Chev. Silverado Z71 that got about
noticeably more miles to the gallon. The GMC has a slightly rough idle, I
don't know if this ahs anything to do with the problem. Any ideas on what
it could be?
Thanks,
Blair |
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External
Since: Jan 01, 2004
Posts: 132
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(Msg. 2) Posted: Thu Jun 16, 2005 9:46 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
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External
Since: Mar 16, 2004
Posts: 23
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(Msg. 3) Posted: Thu Jun 16, 2005 10:25 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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i have a 98 gmc suburban with the 350. on the highway, if i keep it down to
60 mph on two lane and 70 mph on freeways, i am able to pull 18 mpg. not
bad at 90k miles.
"Bill" <B512RACING RemoveThis @webtv.net> wrote in message
news:26695-42B23970-283@storefull-3153.bay.webtv.net...
> How many miles do you have on this Truck?
> What do you consider poor mpg?
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: Poor gas mileage |
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External
Since: Nov 28, 2004
Posts: 106
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(Msg. 4) Posted: Thu Jun 16, 2005 10:55 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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When was the last time you had it thoroughly tuned? Out-of-tune engine =
poor mileage.
"Blair Chesterton" <bchesterton DeleteThis @sympatico.ca> wrote in message
news:qPose.9526$Qr3.1093674@news20.bellglobal.com...
> Hello,
>
> I own a 98 GMC Sierra Z71 5.7 Vortec that seems to be getting really poor
> mileage. I previously owned a 97 Chev. Silverado Z71 that got about
> noticeably more miles to the gallon. The GMC has a slightly rough idle, I
> don't know if this ahs anything to do with the problem. Any ideas on what
> it could be?
>
> Thanks,
>
> Blair
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: Poor gas mileage |
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Joined: May 17, 2005
Posts: 1396
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(Msg. 5) Posted: Fri Jun 17, 2005 7:28 am
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
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| hardworking wrote: |
i have a 98 gmc suburban with the 350. on the highway, if i keep it down to 60 mph on two lane and 70 mph on freeways, i am able to pull 18 mpg. not bad at 90k miles.
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Not too bad, I can pull about 18 out of my 89 4x4 burb with 172K on it now. I have had it since new and the MPG has increased a bit as it gets older. When I cam back for South Carolina last month I was really booking and averaged 75 MPH to 80 MPH and was pleased to still get in the high 16's on hilly ground and with A/C on too.
>> Stay informed about: Poor gas mileage |
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External
Since: May 08, 2005
Posts: 12
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(Msg. 6) Posted: Fri Jun 17, 2005 6:13 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Thanks for your responses,
I have approx. 75,000 miles on the Sierra. I am going to do a major on it
real soon as it is probably in need of it. The plugs are platinum type and
are supposed to last quite a while but they probably have about 35,000 miles
on them. I am not getting over 15 mpg combined and my Silverado Z71 got
about 20mpg.
Blair
"Bill" <B512RACING.DeleteThis@webtv.net> wrote in message
news:26695-42B23970-283@storefull-3153.bay.webtv.net...
> How many miles do you have on this Truck?
> What do you consider poor mpg?
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: Poor gas mileage |
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External
Since: May 06, 2005
Posts: 96
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(Msg. 7) Posted: Fri Jun 17, 2005 7:25 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Dont feel bad about your mpg, our 99 jimmy only gets 15 on the highway
between 55-65, anymore than that it goes through the floor. And it town its
6-8 mpg
"Blair Chesterton" <bchesterton RemoveThis @sympatico.ca> wrote in message
news:5WHse.9018$yU.751273@news20.bellglobal.com...
> Thanks for your responses,
>
> I have approx. 75,000 miles on the Sierra. I am going to do a major on it
> real soon as it is probably in need of it. The plugs are platinum type
and
> are supposed to last quite a while but they probably have about 35,000
miles
> on them. I am not getting over 15 mpg combined and my Silverado Z71 got
> about 20mpg.
>
> Blair
>
>
>
>
> "Bill" <B512RACING RemoveThis @webtv.net> wrote in message
> news:26695-42B23970-283@storefull-3153.bay.webtv.net...
> > How many miles do you have on this Truck?
> > What do you consider poor mpg?
> >
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: Poor gas mileage |
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External
Since: Jan 01, 2004
Posts: 132
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(Msg. 8) Posted: Fri Jun 17, 2005 10:06 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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External
Since: Jan 01, 2004
Posts: 132
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(Msg. 9) Posted: Fri Jun 17, 2005 10:11 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On my 97' Z71,I changed the factor plugs at 65,000 miles and didn`t
gain anything,and they still looked good.
All I got with that was 12-14 mpg city,and 16-18 mpg hiway. >> Stay informed about: Poor gas mileage |
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External
Since: Mar 16, 2004
Posts: 23
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(Msg. 10) Posted: Fri Jun 17, 2005 10:18 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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i dont even bother doing the in town gas mileage. it varies so much that it
is not worth figuring out. my burban is for the highway and i save the
smaller s10 for the city. if the silverado has the 5.3 liter, then 20 would
sound about right.
does anyone know if octane rating affects mpg on the 350s. i only use 87
rating. would the preimum give me any better.
"Adam Frazier" <abomb6900 RemoveThis @copper.net> wrote in message
news:42b36a3e_4@newsfeed.slurp.net...
> Dont feel bad about your mpg, our 99 jimmy only gets 15 on the highway
> between 55-65, anymore than that it goes through the floor. And it town
> its
> 6-8 mpg
>
> "Blair Chesterton" <bchesterton RemoveThis @sympatico.ca> wrote in message
> news:5WHse.9018$yU.751273@news20.bellglobal.com...
>> Thanks for your responses,
>>
>> I have approx. 75,000 miles on the Sierra. I am going to do a major on
>> it
>> real soon as it is probably in need of it. The plugs are platinum type
> and
>> are supposed to last quite a while but they probably have about 35,000
> miles
>> on them. I am not getting over 15 mpg combined and my Silverado Z71 got
>> about 20mpg.
>>
>> Blair
>>
>>
>>
>>
>> "Bill" <B512RACING RemoveThis @webtv.net> wrote in message
>> news:26695-42B23970-283@storefull-3153.bay.webtv.net...
>> > How many miles do you have on this Truck?
>> > What do you consider poor mpg?
>> >
>>
>>
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: Poor gas mileage |
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External
Since: Mar 16, 2004
Posts: 23
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(Msg. 11) Posted: Fri Jun 17, 2005 10:21 pm
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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also, i put in a new fuel filter, thing was plugged bad as it made the fuel
pump sound loud. the guy at the shop said it can mess up the computer and
lower mileage. i stuck with standard plugs when i had them replaced along
with the filter.
"Blair Chesterton" <bchesterton.RemoveThis@sympatico.ca> wrote in message
news:5WHse.9018$yU.751273@news20.bellglobal.com...
> Thanks for your responses,
>
> I have approx. 75,000 miles on the Sierra. I am going to do a major on it
> real soon as it is probably in need of it. The plugs are platinum type
> and are supposed to last quite a while but they probably have about 35,000
> miles on them. I am not getting over 15 mpg combined and my Silverado Z71
> got about 20mpg.
>
> Blair
>
>
>
>
> "Bill" <B512RACING.RemoveThis@webtv.net> wrote in message
> news:26695-42B23970-283@storefull-3153.bay.webtv.net...
>> How many miles do you have on this Truck?
>> What do you consider poor mpg?
>>
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: Poor gas mileage |
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External
Since: May 06, 2005
Posts: 96
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(Msg. 12) Posted: Sat Jun 18, 2005 9:02 am
Post subject: Re: Poor gas mileage [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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The only reason we know is our jimmy has the electronic crap that shows
distance to empty and mpg, yeah, at 35 or 40 in town its down to 6-8 maybe 9
or 10 if were lucky. I've got a cylinder 4 misfire code and cant find the
reason for the problem, changed all plugs, wires, cap, rotor, and checked
compression.
"Bill" <B512RACING.TakeThisOut@webtv.net> wrote in message
news:26695-42B38FC6-509@storefull-3153.bay.webtv.net...
> 6-8 mpg? Do you have your foot on the floor? My 2500 HD 6.0 get's 11
> mpg.
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: Poor gas mileage |
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