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Discussion Starter · #1 ·
:angry:
My wife bought a TB last year after extensive SUV search and allot of test drives. She bought the most comfortable one the 2004 trailblazer. Well the damn thing has never gotten more than 14 MPG and that was on a trip. We have had it in 3 or 4 times and consulted with a GM investigater but now we are being told (so they don't have to comply with the lemon law here in MD) that there is nothing wrong with the car. We have documented the milage and have documented our friends with the exsact same car and they all average a good 5 to 6 MPG's better than ours. Working for Johnson Controls I could have bought almost any car on the planet for a supplier discount. I am disgusted with how we are treated and the BS we are hear because they don't have a clue as to what is causing this and they don't want to deal with it. Does anyone eles have a below mfg. mpg problem.
 

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Sorry to hear this. MPG like that is expected for the first few hundred or even thousand miles, but obviously not for a year.

I suggest you take the car to another dealer, and approach the dealer with this line (my favorite):

"I've taken this to dealership X, but their mechanics have been unable to identify the reason for my poor fuel economy. I heard from a friend that your mechanics are the best and so I thought I'd bring it here to see if you could help me out and win my business in the future."

you might add:

"I've followed all of the advice on how to improve my fuel economy, such as laying off the gas at stoplights, cruising whenever possible, windows up on the freeway, vents instead of A/C on a good day, etc., and I've even driven my friends Trailblazer to confirm that it isn't me with a lead foot who is causing the poor fuel economy. Their vehicles get much better MPG with the same engine." (Just want to cover your bases here and take away possible excuses - I would also probably not mention that your wife drives it, if you want to say you were the one making the comparisons in friends cars -- my girl is constantly on either the gas or the brakes....:p)

If you approach the other dealership's service mechs with a positive, non-confrontational attitude - I think they should be eager to find the source - or a possible source - of the problem.
 

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If your friend have the same model (same year), monitor the tach first to determine if the engine rpm's are similar to your friend's for the same drive. I am assuming that you have an automatic trans. If this is okay, the tranny is functioning correctly and the motor is putting out the required torque at those rpm's.
Then, you can move onto the sensors, etc....

And if the tach says too many rpm's for the speed range-Since I'm not a truck guy, I would be also questioning what the differential ratios are compared to the other vehicles.
 

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It weighs 5000 lbs. It's got the aerodynamics of a brick. It has to push power through a pointless 4WD system.

It gets lousy mileage.

Duh.
 

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Originally posted by AMcA@Apr 2 2004, 02:15 AM
It weighs 5000 lbs. It's got the aerodynamics of a brick. It has to push power through a pointless 4WD system.

It gets lousy mileage.

Duh.
reminds me of the people that complained about quality issues with their new H2's. many figured something was wrong... they gas mileage was horrible. geez people! you're driving a tank! think about it!

though this guy is different, because he's comparing to people with identical vehicles that get better gas mileage. still, the TB t'aint little. can't expect much in the economy department!
 

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Originally posted by paul8488+Apr 2 2004, 03:41 PM--></div><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (paul8488 @ Apr 2 2004, 03:41 PM)</td></tr><tr><td id='QUOTE'> <!--QuoteBegin-AMcA@Apr 2 2004, 02:15 AM
It weighs 5000 lbs.  It's got the aerodynamics of a brick.  It has to push power through a pointless 4WD system.

It gets lousy mileage.

Duh.
reminds me of the people that complained about quality issues with their new H2's. many figured something was wrong... they gas mileage was horrible. geez people! you're driving a tank! think about it!

though this guy is different, because he's comparing to people with identical vehicles that get better gas mileage. still, the TB t'aint little. can't expect much in the economy department! [/b][/quote]
Yes, this guy is way different. If my Suburban can get close to 16 mpg cruising at 80, he has every right to expect more than 14 out of his TB.

There is definitely something wrong with it.
 

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I have had a 2002 Trailblazer, a 2003 Bravada, and a 2004 Ranier-I was never able to get better than 14-16 mpg. Unfortunately, that is what it is. And even more unfortunate is that if the computer shows nothing wrong, such as sensors out of range, etc., there is no way to find any improvement.
 

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Discussion Starter · #13 ·
Sorry I was on a vacation. We rented a SUV not made by GM and it got 19.5. To the Duh. We know what we bought and we reseached every SUV on the market. Like I said we could have bought any one of them at a discount. (I work for Johnson Controls, and no I am not in the automotive divission). The TB was the most comfortable out of all of them! At least some of you can read. I think we will do a trade in soon due to the MPG and as was mentioned the sensors. We have also had problems with lights and controls the come about AFTER having the car in the shop. The TB has been seen by four different dealers and had some district gooru look into it. Some posted the best comments. It is what it is, nice comfort for being a POS. Oh yea to anyone who thinks it's the way we drive your FOS. We have driven our friends and got better milage than they normally do. I like the slap problem to cuase that what my *** feels every time we pass agas station.
 

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What was this other SUV U rented???
 

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Doesn't the TB get very bad MPG anyways?
 

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Originally posted by penske@Apr 19 2004, 08:26 PM
I have had a 2002 Trailblazer, a 2003 Bravada, and a 2004 Ranier-I was never able to get better than 14-16 mpg. Unfortunately, that is what it is. And even more unfortunate is that if the computer shows nothing wrong, such as sensors out of range, etc., there is no way to find any improvement.
My 2004 Rainier V8 gets 18.5 mpg regularly, 20 mpg if I keep it under 75 on the highway.

The 14 mpg truck. What axle does it have? They are available with a 3.42, 3.73 and 4.10 gears. 4.10 gears will give you the worst FE of course. Have the brakes checked for abnormal brake drag. Make sure you are running 30/35 psi front/rear as recommended. What speeds are you running for 14-16 mpg. Time of year? I see a big drop in MPG on some of my cars when running the "oxygenated", ethanol blended winter fuels. I went from 15 on my wagon to 18 in a week. Why, Michigan goes from winter to summer fuel 4/1. I was amazed, and the last three tanks have shown the same improvement.

What other stuff is in the truck besides the driver. If you often run with 4-5 passengers, that is a lot more weight to haul around, especially if you figure 100-150# per passenger (small child factor lowering the average weight)


Just some thoughts. Correct inflation and correctly operating brakes is a big deal. If you also run in A4WD mode instead of 2wd, the front diff , half shafts, and front prop shaft all are engaged and spinning needlessly..
 

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Discussion Starter · #18 ·
There are no more than 2 people in the truck at one time and the speed most of the time is around 45 mph. The tires are fine and were told (after 4 dealers have looked at it) there is nothing they can find wrong with it. Ofcouse we use the test standards of having your windows up and not running any AC or heat (that is what one guy told us that the EPA tests this way) We plan to rid ourselvles of this gas hog back to GM. My wife is in contact with dateline on NBC. She loves the comfort but wont stand for being lied to or the smoke and mirors that have been used by GM in dealing with the issue includeing not properly documenting the service of the SUV. The next car we buy will be mine and I wont buy from a corporation with this kind of treatment to its customers.
 

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You want comfort of a TB and mileage of a Aveo.
Have agree with LakeMichigan, regarding with winter gas. Have a 03 GMC ext 4x4 Z71, with a cap and ladders on it. Got in December and have been see the milage rise. But driving into a headwind is a killer.
 

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Originally posted by AMcA@Apr 1 2004, 08:15 PM
It weighs 5000 lbs.  It's got the aerodynamics of a brick.  It has to push power through a pointless 4WD system.
But if his mileage is 5-6 mpg less than others with
similar vehicles, that could constitute a problem on
his TB. Obviously gear ratios, use of throttle, and
other factors come into play and should be checked
to make sure the playing field is even.
 
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