02-07-2011, 08:19 PM | #1 |
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Location: dewitt iowa
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Increase mpg
OK here is my question I want to get more than 16/gal out of my 2008 Silverado LS with 4.8. I thought of a power programer. Do they work? Asked my mechanic he says it wil fry my computer, dealer customer service says it will void my warrinty, Lots of questions anyone have any ad ice?
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02-07-2011, 08:20 PM | #2 |
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Re: Increase mpg
Oh I forgot I don't know how to use this site
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02-07-2011, 08:50 PM | #3 |
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Re: Increase mpg
You may want to look for a problem if you are only getting 16. I normally average 19-20 in mine, even my 4runner with a 5.3 and no overdrive gets 15.
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02-07-2011, 09:47 PM | #4 |
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Re: Increase mpg
Is that 16 in town or on the highway? Is that what you see year-round? I know my mileage suffers greatly in the winter because I am more apt to let me truck warm up, and also will leave it running sometimes when I run inside.
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02-07-2011, 11:06 PM | #5 |
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Re: Increase mpg
Soft tonneau, lowering kit (might help on the highway), and a REAL tune. Forget the handheld. Look up Black Bear performance, Wheatley, or Nelson tuning. They do mail order tuning, but are starting to do handhelds with your stock and custom tune
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02-07-2011, 11:24 PM | #6 |
Formerly- 1972SuperCheyenne
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Re: Increase mpg
K&N FIPK intake. Made a HUGE difference on mine. I have a 07 Silverado classic crew cab 2wd. I get 17 around town and 20+ on the highway.
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02-08-2011, 07:51 AM | #7 |
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Re: Increase mpg
Is it a 4x4 does it have a lift or bigger then stock size tires?Driving habits can hurt your mpg also.My little test is drive the speed limit and use cruise control the max they will show you the max mpg your truck would get.
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02-08-2011, 09:25 AM | #8 | |
Has more rust than truck...
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Re: Increase mpg
Quote:
What he said!!!!! you will not do any single thing that will benifit you more. |
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02-08-2011, 04:57 PM | #9 | |
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Re: Increase mpg
Quote:
what fuel are you running? how do you drive? We have tuned several vehicles and gained 3% in MPGs.
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71 Cheyenne C10 LWB cam'd 6.0/T56 Swap Last edited by Shon; 02-08-2011 at 04:57 PM. |
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06-06-2012, 04:47 PM | #10 | |
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Re: Increase mpg
Quote:
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06-07-2012, 05:22 PM | #11 |
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Re: Increase mpg
What gears do you have? My 08 4.8L with 3.23's got that kind of mileage around town. Not enough gear...
Like the others said, go custom tune. Blackbear Performance, Google it. That's what I have on my 5.3L '08. I had the 4cyl mode turned off and still get 16-17mpg around town. Averaged 19.3 on a 500 mile trip recently. Your dealership is right, PCM tune will void your warranty. You can purchase another computer to swap out with the original if you have to go in for service though. Oh.... and find another mechanic, yours has been breathing in too many exhaust fumes!!!
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07-10-2012, 04:45 PM | #12 |
Parts and more parts
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Re: Increase mpg
As stated above, I get 19 to 20 from my 5.3 with a set of 3.42 gears, in my 2011 SWB. I have put in an EFI Live upgrade on my engine tune and tightened up the shift points on the tranny. I have installed a Cold air intake and a set of Kooks headers to an exhaust that has a magnaflow muffler. I am running a 265/50/20 tire size. I have not lost any MPG, but I did not gain any either, I did gain a lot of torque with the headers.
I have a local tuner guy that is big into the Gen III and GenIV engines.
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10-11-2012, 04:48 PM | #13 |
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Re: Increase mpg
i was always told by dealer techs that you cant do anything to void your warranty completely. only if they can trace the problem directly to a modification that your have made will it no longer be covered under warranty
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10-12-2012, 09:40 PM | #14 |
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Re: Increase mpg
Modifying the ECM/TCM calibration WILL void the powertrain warranty, Yes they will know
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10-18-2012, 07:14 PM | #15 |
Parts and more parts
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Re: Increase mpg
I was good with that, when I did mine. I am not sorry either. Runs great and worth every penny.
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Frank |
10-18-2012, 07:45 PM | #16 |
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Re: Increase mpg
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