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Chevy Silverado and GMC Sierra Mileage Improvement

24 messages,  Last post on Feb 19, 2010 at 10:25 AM

You are in the Chevrolet Silverado & GMC Sierra Forum.

What is this discussion about? Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Silverado 2500, Truck

Messages Page 3 of 3

#21 of 24 Re: Engine Stalling [kmarlar] by ttaupier1

Jan 03, 2010 (6:00 pm)

Replying to: kmarlar (Jan 03, 2010 5:51 pm)
Catalytic converters are one of the greatest emission add-ons ever to be installed on vehicles. By cleaning up the pollutants left over from combustion, they reduce tailpipe emissions of hydrocarbons (HC) and carbon monoxide (CO) to extremely low levels, when everything is operating normally, that is. But sometimes things do not operate normally, and when that happens engine performance may suffer or the vehicle may fail an emissions test.
 
See the article listed below for a good start
 
http://www.aa1car.com/library/converter.htm
 
Lets us know how you make out!

#22 of 24 03 1500 - 13.2 MPG: Can this improve? by opc167

Feb 09, 2010 (11:20 am)

I just bought a GMC 1500 6.0 2wd w/ 150k miles. It runs great but getting 13.2 mpg. Is this the norm and if if not, should I start with changing the coils with a plug change? I wasn't expecting this low of gas mileage. I'd like to put it on a computer but I'm not sure what's good out on the market. The dealship wasn't my first choice.
 
  No check engine, no problems..just inquiring about mileage.
 
Thanks.....newbee.

#23 of 24 Re: 03 1500 - 13.2 MPG: Can this improve? [opc167] by ttaupier1

Feb 19, 2010 (10:27 am)

Replying to: opc167 (Feb 09, 2010 11:20 am)
Hi OPC,
 
Yes I fear that is all the mileage you are going to get, even with K&N, and a tonneau cover, I'm averaging 18.2mpg(city20% and highway80%) (5.3 liter V8), it also has to do with your rear end gearing.. if you have the higher gear set or a towing lower gear set.
 
My guess is make as much air flow through the engine with as much ease, then due to you large V8, up the gearing of your rear, that will likely help. if you dont live in Colorado or in the mts in general ...
 
I bought the mass airflow sensor and have had no luck, just that there is too much oxygen in the mix.. and an engine light is now cycling on and off
 
see my post here General Intake / Exhaust Mods ... #862 of 864The Generation II FIPKŪ is K&N's & Granatelli MAF by ttaupier1, might be an option
 
http://townhall-talk.edmunds.com/direct/view/.f131b21/861!keywords=#MSG861

#24 of 24 Re: 03 1500 - 13.2 MPG: Can this improve? [ttaupier1] by opc167

Feb 19, 2010 (10:25 am)

Replying to: ttaupier1 (Feb 19, 2010 10:27 am)
I'm in Macon Ga. Since my first reply, I've been thru 2 more tanks and still getting 13.2. I asked for it though. I wanted something that would pull. I got it!

Messages Page 3 of 3

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