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Username Post: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???        (Topic#79461)
blown89 
Member
Posts: 11

Reg: 10-30-04
10-30-04 06:32 AM - Post#541932    

I just recently purchased a new 2004 Chevy Tahoe LT. I was wondering what after market products might help with gas mileage. I have heard K&N, exhaust etc...what modifcations really help mileage. Thanks

 
ExaTorq 
Senior Member
Posts: 1296

Loc: Dallas, TX
Reg: 07-16-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
10-30-04 08:05 AM - Post#541933    
    In response to blown89

I've had good luck improving my city/highway mileage on my truck with a Wester's tune...about 1 MPG in the city, and close to 3 MPG on the highway. YMMV (pun intended)...
Brian '03 Tahoe 5.3L FFV/ Wester's 89/91 tune / Outlaw CAI


 
2001GMC 
Chatroom Supporter
Posts: 31

Reg: 09-16-04
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
10-30-04 02:32 PM - Post#541934    
    In response to ExaTorq

I totally agree with pongo000, intake, exhaust (cat back) and a tune and you will pick up 1 to 4 mpg...if you can keep your foot out of the fun meter!
2001 ECSB 5.3 Westers, aFe, Corsa cat back


 
nodakbassmaster 
Super Senior Member
Posts: 4397
nodakbassmaster
Loc: Poorhouse, SD
Reg: 03-14-04
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
10-30-04 03:11 PM - Post#541935    
    In response to blown89

Well, I can tell you to not waste your time with a throttle body spacer, or underdrive pulleys or a Tornado for MPG's. They don't get any better, but they don't really get any worse. Wider and or taller tires are detrimental as well.
Richard

'09 Silverado 3500HD CC LB D/A LTZ Z71, Mods Annonymous Member #3


 
notcamero 
Senior Member
Posts: 943

Reg: 08-02-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
10-31-04 04:54 AM - Post#541936    
    In response to nodakbassmaster

Guys at work swear by the K&N filters on the big trucks. Say it gives 1 to 2 mpg improvement. Also, might put on a vacuum gauge with the color coded scales. Keep in the green as possible, big improvement, especially if others drive the vehicle and make the effort.

 
jefro 
Very Senior Member
Posts: 1121

Loc: Texas
Reg: 06-18-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
10-31-04 08:11 AM - Post#541937    
    In response to blown89

I couldn't say that the K&N did anything other than lighten my wallet.

Remove all the junk that you don't need to tote around. Replace the tires with any of the silicone fuel saving types. Keep them at the max pressure.
Learn to drive in a fuelish manner.
Keep cruise control on if safe.
Keep it clean and waxed.
I think that the teflon engine stuff has improved most every truck for the last 20 years. I didn't use exact just guesstimates.

 
sebring95 
Senior Member
Posts: 463
sebring95
Reg: 06-14-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
11-01-04 02:18 AM - Post#541938    
    In response to blown89

None of these extras you'll buy will ever pay for themselves in fuel savings alone. Driving with a light foot is the best option, and costs nothing. I run mine like I do any vehicle and I'm fairly pleased with the mileage. 20mpg on the highway is not uncommon. It's harder on fuel around town, but I rarely drive around town. I wouldn't own it if all I did was drive it around town.
'03 Silverado 4x4


 
sebring95 
Senior Member
Posts: 463
sebring95
Reg: 06-14-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
11-01-04 02:18 AM - Post#541939    
    In response to blown89

None of these extras you'll buy will ever pay for themselves in fuel savings alone. Driving with a light foot is the best option, and costs nothing. I run mine like I do any vehicle and I'm fairly pleased with the mileage. 20mpg on the highway is not uncommon. It's harder on fuel around town, but I rarely drive around town. I wouldn't own it if all I did was drive it around town.
'03 Silverado 4x4


 
Anonymous 

Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
11-01-04 02:49 AM - Post#541940    
    In response to notcamero

Look at this before wasting yout money of an after-market filter

Quote:

If a filter is using "better airflow" as their marketing tool, remember this....Does it flow better? At very high airflow volumes, probably. BUT, Our trucks CAN'T flow that much air unless super-modified, so what is the point? The stock filter will flow MORE THAN ENOUGH AIR to give you ALL THE HORSEPOWER the engine has to give. And this remains true until the filter is dirty enough to trip the air filter life indicator. At that point performance will decline somewhat. Replace the filter and get on with it.





 
ExaTorq 
Senior Member
Posts: 1296

Loc: Dallas, TX
Reg: 07-16-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 05:45 AM - Post#541941    
    In response to sebring95

Quote:

None of these extras you'll buy will ever pay for themselves in fuel savings alone.




I disagree. A custom PCM tune will, under most conditions, provide an increase in mileage. For a truck driven 15,000 miles a year, getting 14 MPG, total fuel costs at $2/gal. would be $2143. With a modest 1.5MPG increase, total fuel costs would drop to $1935, a savings of $208. On a $395 tune, gas savings would begin roughly 2 years after installation.
Brian '03 Tahoe 5.3L FFV/ Wester's 89/91 tune / Outlaw CAI


 
sebring95 
Senior Member
Posts: 463
sebring95
Reg: 06-14-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 08:04 AM - Post#541942    
    In response to ExaTorq

What's your logs look like to come up with your mpg increase?
'03 Silverado 4x4


 
ExaTorq 
Senior Member
Posts: 1296

Loc: Dallas, TX
Reg: 07-16-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 10:16 AM - Post#541943    
    In response to sebring95

I've tracked every tank of gas I've run through my truck. Here are the statistics for pre-Wester's PCM and post-Wester's PCM:

Stock PCM
---------
Mean: 14.2 MPG
SD: 0.96 MPG
N: 51 tanks
Min: 11.4 MPG
Max: 16.0 MPG

Wester's PCM
------------
Mean: 15.1 MPG
SD: 0.91 MPG
N: 56 tanks
Min: 13.5 MPG
Max: 18.6 MPG

The SD for both samples is close, so I have no reason to disagree with the mean. The mean represents the average of both city and highway driving; the Wester's tune gives me about 1 MPG more in that mode. The max values represent highway driving; I gained almost 3 MPG more with the Wester's tune on the highway than with the stock tune.
Brian '03 Tahoe 5.3L FFV/ Wester's 89/91 tune / Outlaw CAI


 
blown89 
Member
Posts: 11

Reg: 10-30-04
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 10:45 AM - Post#541944    
    In response to ExaTorq

What modifications exactly does the Westers Tune include. How much is this mod, does it void the warrenty and is it easy to do the install. Thanks

 
ExaTorq 
Senior Member
Posts: 1296

Loc: Dallas, TX
Reg: 07-16-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 11:25 AM - Post#541945    
    In response to blown89

Wester's offer custom tuning, which means you can modify just about anything that's controlled by the PCM to your heart's content. Major areas of attention usually include shift firmness, reduction of torque management, timing/spark table adjustments for more power/torque, and better mixture management. You can check out more details here:

http://westers_garage.eidnet.org/
Brian '03 Tahoe 5.3L FFV/ Wester's 89/91 tune / Outlaw CAI


 
sebring95 
Senior Member
Posts: 463
sebring95
Reg: 06-14-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 11:28 AM - Post#541946    
    In response to ExaTorq

What gears are you running? My 5.3L 3.73 Tahoe has much higher mpg numbers running stock. I wonder if your engine was running properly from the start. My max is 21.3 (actually, numerous tanks in the 20-21mpg range), minimum was 12.2 which was pulling a trailer on the highway. My overall mean is 17.9 over 34k miles. I'd like to think I could add 3mpg to that with a tune, but I'm quite skeptical. I've done tuning on other vehicles and have never seen or heard of a 6% increase without something else coming into play. A lighter foot goes the longest way. My wife actually does better in general driving with the Tahoe because she doesn't hit the go-pedal as hard as I do around town. I usually run 72 on the highway. The few tanks I recall running 80mph drops it down to about 19mpg.
'03 Silverado 4x4


 
ExaTorq 
Senior Member
Posts: 1296

Loc: Dallas, TX
Reg: 07-16-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 11:48 AM - Post#541947    
    In response to sebring95

What percentage of your miles driven are city vs. highway? I'd estimate about 80% of my miles are city. I can easily get 3 more MPG on the highway than around the city.
Brian '03 Tahoe 5.3L FFV/ Wester's 89/91 tune / Outlaw CAI


 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 05:14 PM - Post#541948    
    In response to ExaTorq

My old carbed fullsize van can knock down 20 mpg cruising at a steady 70 mph on the highway. Around town I can make it get 10 or 15 just depends on how much I punch it and how much of a hurry I am in, or how many hondas pull up next to me. Gas mileage has a direct relation to how hard you mash the pedal.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
ExaTorq 
Senior Member
Posts: 1296

Loc: Dallas, TX
Reg: 07-16-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 06:55 PM - Post#541949    
    In response to 1983G20Van

I also think hitting 50+ traffic lights to and from work will have an effect (not a good one, either) on mileage!
Brian '03 Tahoe 5.3L FFV/ Wester's 89/91 tune / Outlaw CAI


 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-01-04 07:02 PM - Post#541950    
    In response to ExaTorq

The thing I have learned about lights is that if you see one red ahead take your foot off the gas and let your vehicle slow down some. That does two things for you. First you are off the gas(saving gas) and don't have to use the brake as much(because you are coasting and slowing down before you get to the light). Then try to time the light so that you never really stop at it. Starting back up from even 2 mph is better than from a stop as far as mileage is concerned.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
CaptainK 
Senior Member
Posts: 8242
CaptainK
Loc: Maryland
Reg: 02-25-02
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
11-02-04 01:55 AM - Post#541951    
    In response to blown89

Lots of downhill driving
'99 Silverado (NBS)


 
sebring95 
Senior Member
Posts: 463
sebring95
Reg: 06-14-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-02-04 03:39 AM - Post#541952    
    In response to ExaTorq

The majority of mine are highway, probably 60/40 worst case. We do idle a lot though, i think my hours works out to be an average of 34mph.

My max numbers are on highway only trips. Do you ever do just highway trips? Your max should be much higher if you do.
'03 Silverado 4x4


 
ExaTorq 
Senior Member
Posts: 1296

Loc: Dallas, TX
Reg: 07-16-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-02-04 04:55 AM - Post#541953    
    In response to sebring95

Max on highway trips is 17-18 MPG at about 75 MPH. I've never seen anything higher than 18.6.
Brian '03 Tahoe 5.3L FFV/ Wester's 89/91 tune / Outlaw CAI


 
2004maxx 
Very Senior Member
Posts: 1817

Loc: Phoenix, AZ
Reg: 11-10-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-02-04 06:53 AM - Post#541954    
    In response to sebring95

Most of my miles are spent on the highway...BUT I've found that (using my trip computer's avg speed) that most of my TIME must be spent in the city, because my average speed is only 37-39 MPH (even though I travel 70-80 on the highway). I've also found that on the highway I can get 36-40 MPG (no joke) if I set the cruise for 70 on a flat section of highway.

 
2004maxx 
Very Senior Member
Posts: 1817

Loc: Phoenix, AZ
Reg: 11-10-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-02-04 06:54 AM - Post#541955    
    In response to CaptainK

Quote:

Lots of downhill driving




Now if only we could find a way to do downhill both ways!

 
CaptainK 
Senior Member
Posts: 8242
CaptainK
Loc: Maryland
Reg: 02-25-02
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-02-04 06:59 AM - Post#541956    
    In response to 2004maxx

That sure would be nice
'99 Silverado (NBS)


 
jefro 
Very Senior Member
Posts: 1121

Loc: Texas
Reg: 06-18-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
11-02-04 08:23 AM - Post#541957    
    In response to blown89

I sent emails to some top name companies trying to get them to make a custom program for a fleet use. I wanted soley a fuel saving program. They all declined.

 
WVRidgeRunner 
Very Senior Member
Posts: 2159
WVRidgeRunner
Age: 47
Loc: This week: Hill AFB, UT
Reg: 03-20-04
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE???
11-02-04 05:35 PM - Post#541958    
    In response to jefro

Trucking companies use Rev Limiters set low, and Governers set at 67MPH to save fuel and for safety reasons...

You should be able to find something to use for Medium and Light Duty fleet use... I can't believe they told you no...
WV Ridge Runner
- 05 Impala LS
- 03 Black Silverado 2500HD 4X4 LB CC LT
- 93 S-10 4X4 Blazer (Tahoe LT)
- 79 Monte Carlo
- Harleys, 4-Wheelers, etc...
- New! 07 Cobalt


 
2004maxx 
Very Senior Member
Posts: 1817

Loc: Phoenix, AZ
Reg: 11-10-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-03-04 06:18 AM - Post#541959    
    In response to WVRidgeRunner

Quote:

Trucking companies use Rev Limiters set low, and Governers set at 67MPH to save fuel and for safety reasons...





I wish they were always that way. I can't tell you how many times I've seen one truck going 72 MPH try to pass a truck going 70 MPH (both of which are sitting in the left most lanes of a three or four lane highway. Arizona has no laws about keeping trucks on the right and (while they can) they don't have separate speed limits for trucks. Then there are the maniac ones (true story) that will travel 85+ (I was going 80 and I didn't care to find out his real speed, but I'll bet it was higher) in the carpool lane.

 
sebring95 
Senior Member
Posts: 463
sebring95
Reg: 06-14-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-03-04 06:23 AM - Post#541960    
    In response to 2004maxx

You don't want split speed limits for trucks. Take a drive through Ohio to find out why. I think I've driven 90% acrossed the state without ever getting out of the passing lane. And when the trucks are blocking traffic, ones going 55mph being passed by one going 56mph. Lots of fun!
'03 Silverado 4x4


 
2004maxx 
Very Senior Member
Posts: 1817

Loc: Phoenix, AZ
Reg: 11-10-03
Re: CHEVY TAHOE 2004 - WAYS TO IMPROVE GAS MILEAGE
11-03-04 06:36 AM - Post#541961    
    In response to sebring95

Actually I would. I've been to California and it was soo much better b/c their trucks are limited to the left lane. It gets reaaallly frustrating when you're in traffic and there are three or four across. You're stuck! Or, when you're in rush hour traffic and it starts to speed up, but you're stuck behind one that has decided to plant itself in the left lane, and now it needs to cross all the lanes because its about to miss its exit. Trucks in the right lane are a good thing.

 
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