01' Sub. 1500 5.3 4wd mileage ?s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nxtruck · 03-01-2011, 06:38 PM

Does anyone have any feedback on improving mileage with one of these trucks? I'm considering a programmer, CAI, catback, etc. Anything to pick the mileage up some. This truck gets 12.3 mpg in mixed driving and, from what I've read and heard, some of these trucks are getting close to 20 mpg on the highway and 16-17 in mixed driving. Anyone have any ideas or input?

usmcchevy · 03-01-2011, 07:40 PM

On my last truck the only things that improved mileage a considerable amount were a custom tune(solid 2mpg) and E-fans (1mpg). The plug in programmers I have experienced never came close to a custom tune in anyway. There are plenty of companys offering mail order tunes that will work great on a mostly stock setup. The E-fans were just stock e-fans off of a LS1 Camaro wired to be controlled by the PCM.

nxtruck · 03-07-2011, 11:10 AM

Thanks for the info!!

Pondscum · 03-10-2011, 07:05 PM

Is there anywhere on this site that shows where to wire the fans in so the pcm controls them. I havent seen anything like that and wasnt real sure it could be done.

usmcchevy · 03-10-2011, 09:16 PM

Pondscum, your PCM as it comes from the factory is not set up for controlling E fans. It needs to be tuned in order to use it for fan control. Here are the wiring diagrams, but I bought my harness pre-made ($100ish).

99-02 There is also a 2 relay version, but it seems to be VERY hard on relays.

03+

Pondscum · 03-10-2011, 11:33 PM

WOW, thats awsome learn sumthin new everyday, thanks for the help, jus wonderin who did u get your harness from?

Pondscum · 03-10-2011, 11:38 PM

With my 00 Sierra RCSB 2wd w/ a 5.3 im getting around 18 to 19 mpg with a Hypertech programmer, dual exhaust (cats removed), and air intake box cut out. Proly have longtube headers on by the end of summer hopefully that will help also.

03-01-2011, 06:38 PM	#1
nxtruck Registered User Join Date: Jun 2006 Location: Jackson, Mo. Posts: 607	01' Sub. 1500 5.3 4wd mileage ?s Does anyone have any feedback on improving mileage with one of these trucks? I'm considering a programmer, CAI, catback, etc. Anything to pick the mileage up some. This truck gets 12.3 mpg in mixed driving and, from what I've read and heard, some of these trucks are getting close to 20 mpg on the highway and 16-17 in mixed driving. Anyone have any ideas or input? __________________ Chris 1966 Chevy C10 LWB, 434 sbc, TH350, 12-bolt, factory suspension, pump gas 7.02 @ 95.8, 1.45 60' 1965 Chevy C10 LWB, 355 sbc, TH350, daily driver

03-01-2011, 07:40 PM	#2
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: 01' Sub. 1500 5.3 4wd mileage ?s On my last truck the only things that improved mileage a considerable amount were a custom tune(solid 2mpg) and E-fans (1mpg). The plug in programmers I have experienced never came close to a custom tune in anyway. There are plenty of companys offering mail order tunes that will work great on a mostly stock setup. The E-fans were just stock e-fans off of a LS1 Camaro wired to be controlled by the PCM. __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

03-07-2011, 11:10 AM	#3
nxtruck Registered User Join Date: Jun 2006 Location: Jackson, Mo. Posts: 607	Re: 01' Sub. 1500 5.3 4wd mileage ?s Thanks for the info!! __________________ Chris 1966 Chevy C10 LWB, 434 sbc, TH350, 12-bolt, factory suspension, pump gas 7.02 @ 95.8, 1.45 60' 1965 Chevy C10 LWB, 355 sbc, TH350, daily driver

03-10-2011, 07:05 PM	#4
Pondscum Registered User Join Date: Nov 2010 Location: Perry Missouri Posts: 72	Re: 01' Sub. 1500 5.3 4wd mileage ?s Is there anywhere on this site that shows where to wire the fans in so the pcm controls them. I havent seen anything like that and wasnt real sure it could be done.

03-10-2011, 09:16 PM	#5
usmcchevy Has more rust than truck... Join Date: Apr 2005 Location: Ivanhoe, MN Posts: 2,421	Re: 01' Sub. 1500 5.3 4wd mileage ?s Pondscum, your PCM as it comes from the factory is not set up for controlling E fans. It needs to be tuned in order to use it for fan control. Here are the wiring diagrams, but I bought my harness pre-made ($100ish). 99-02 There is also a 2 relay version, but it seems to be VERY hard on relays. 03+ __________________ 1972 Custom/10 SWB, 4.8/4l80e Build thread LSx Swap FAQ index

03-10-2011, 11:33 PM	#6
Pondscum Registered User Join Date: Nov 2010 Location: Perry Missouri Posts: 72	Re: 01' Sub. 1500 5.3 4wd mileage ?s WOW, thats awsome learn sumthin new everyday, thanks for the help, jus wonderin who did u get your harness from?

03-10-2011, 11:38 PM	#7
Pondscum Registered User Join Date: Nov 2010 Location: Perry Missouri Posts: 72	Re: 01' Sub. 1500 5.3 4wd mileage ?s With my 00 Sierra RCSB 2wd w/ a 5.3 im getting around 18 to 19 mpg with a Hypertech programmer, dual exhaust (cats removed), and air intake box cut out. Proly have longtube headers on by the end of summer hopefully that will help also.



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