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  #1  
Old 02-14-2010, 10:10 PM
lancour4 lancour4 is offline
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2006 Chevy TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
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poor gas mileage

I have noticed that my 2006 trailblazer gas mileage as been really poor lately. I average 14 mpg lately. Everything seems to be running smooth with that exception. I had a check engine light come on of P0506 I believe and it was about low RPMs. I read around and it seemed to be that I needed to clean the TB. I did that and everything seemed to be fine. The light went off and the erratic engine idling and lights seemed to go away and run smooth. The only concern now is why my gas mileage has been so poor lately. At least 4 MPG less than I was getting just 4 months ago. If anyone could give me some insight that would be most helpful. Thanks.
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  #2  
Old 02-14-2010, 10:38 PM
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christo829 christo829 is offline
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How many miles? How about maintenance items like air filter, tire inflation? Then
look at the gas you're using. Winterized gas tends to decrease MPG.

A fuel system cleaner might not be a bad idea.

Also, what's your temp gauge reading? It can below without throwing a code,
and will start killing mileage while running cold.

Got a scanner that can read real time data? Perhaps a lazy O2 sensor
is causing some problems.

Good Luck!

Chris
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Old 02-14-2010, 10:43 PM
lancour4 lancour4 is offline
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I have 55k miles and just changed the air filter and ran some fuel injector cleaner. Tire pressure is at 37 and TB has just been cleaned. I know the winter fuel can cause a drop in fuel economy, but would it drop it 4 MPG? I just purchased it in May so this is my first winter with it. I guess I am just wondering if a 4 MPG drop is to be expected.

Temp is running steady at 210
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Old 02-14-2010, 10:51 PM
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Super 88 Super 88 is offline
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Quote:
Originally Posted by lancour4 View Post
I have 55k miles and just changed the air filter and ran some fuel injector cleaner. Tire pressure is at 37 and TB has just been cleaned. I know the winter fuel can cause a drop in fuel economy, but would it drop it 4 MPG? I just purchased it in May so this is my first winter with it. I guess I am just wondering if a 4 MPG drop is to be expected.

Temp is running steady at 210
I would say yes. Seeing as how you are back east I'm sure you are letting the engine warm up a little longer. Just remember - every minute you are idling is ZERO MPG. I lived in Minneapolis/St. Paul area for several years, so I'm well aware of the morning ritual of warming up a vehicle especially if they are stored outside.
The cold air and the road conditions DO play a big role in reducing MPG.
That being said, even here in San Diego where the climate is relatively mild, I still use a little more gas in all my vehicles but especially the TB.

Personally I wouldn't worry too much about it until spring time comes. If your MPG doesn't return to normal then I would start to worry!

Edit: Hate to rub it in - but it was 80 degrees here today and it's suppose to be about the same for the next day or two.
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Old 02-14-2010, 10:52 PM
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christo829 christo829 is offline
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I figured my mpg has dropped around 2-3 for the winter.

Done the 50K service? Check the drivetrain fluids, especially
the transfer case. If any are low, that could affect the mileage
slightly as well. O2 sensor could still be an issue, if you can
see the live data for it. They can get lazy and not throw a code.

37 psi in the tires? Is that what your specs call for? Just curious.

Cheers-

Chris
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Old 02-14-2010, 11:05 PM
lancour4 lancour4 is offline
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Quote:
Originally Posted by christo829 View Post

37 psi in the tires? Is that what your specs call for? Just curious.
The tires call for 38. Seems a little high IMO but I've yet to blow a tire so I'm going with it. Due for new tires soon anyways.

Thanks again everyone.

P.S. I don't warm my vehicle up in the morning. Just about 30 seconds or so before I get going.
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  #7  
Old 02-14-2010, 11:19 PM
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RedEnvoyDenali RedEnvoyDenali is offline
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Quote:
Originally Posted by lancour4 View Post
The tires call for 38. Seems a little high IMO but I've yet to blow a tire so I'm going with it. Due for new tires soon anyways.

Thanks again everyone.

P.S. I don't warm my vehicle up in the morning. Just about 30 seconds or so before I get going.
You may not let the vehicle warm up very much (this is OK if you drive easy until warm) however the engine is still cold and the ECM puts a rich mixture into the system until the engine gets up to operating temp. You should try this at -40 and see how your gas mileage plummets--until spring.
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Old 02-14-2010, 11:52 PM
WOOLUF1952 WOOLUF1952 is offline
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The tire pressure on the side of the tire is maximum pressure. The pressure called for, is listed on the edge of the drivers door.

Has the snow been really bad this year in your area? That really hurts mileage also.
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  #9  
Old 02-15-2010, 09:47 AM
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wardak33 wardak33 is offline
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Quote:
Originally Posted by RedEnvoyDenali View Post
You may not let the vehicle warm up very much (this is OK if you drive easy until warm) however the engine is still cold and the ECM puts a rich mixture into the system until the engine gets up to operating temp. You should try this at -40 and see how your gas mileage plummets--until spring.
Very true. Your PCM basically dumps fuel into the engine and changes shift points in the tranny to higher RPM's in it's attempt to warm up the engine faster. I would say let it sit until the needle goes under 1000 RPM and that would be a decent time to start moving.

And winter fuel blends really do kill the fuel economy on these trucks. I get 16 MPG highway and city, 18 if I don't drive over 60 MPH, whereas I use to get 18-20 easily. A light foot helps when it comes to driving efficiently. keep shifts under 3000 RPM, 2500 if you can, it'll help.
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