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12-06-2017, 03:34 PM | #1 |
Registered User
Join Date: Apr 2002
Location: Manitoba, Canada
Posts: 662
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Poor Fuel Economy - Advice?
Need some advice - I'm getting an average of 13 mpg out of my 2005 GMC Sierra 4x4 with a 4.8L. Truck has 156,000 miles on it. I live in Canada so it's winter right now but the mileage seems pretty low.
Any advice about what helps improve mileage in these trucks? Is this the kind of mileage that others are getting?
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Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said. |
12-06-2017, 05:57 PM | #2 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: Poor Fuel Economy - Advice?
I'd say you're as close to the best you can get now. My '06 K2500 Silverado gets maybe 12mpg downhill with the wind at my back and I have a 6.0L. A heavy 4x4 with a 4.8L has to work a bit.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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12-07-2017, 11:46 AM | #3 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: Poor Fuel Economy - Advice?
My Yukon weighs about 6700 lbs, and with the 5.3 I get around 15-16, but can do a bit better. I've got pretty low rear gears, so my worst mpg is the 10-35mph stop n go stuff. 40+ cruising and it improves drastically.
The stock intake and exhaust system is pretty restrictive, so there are mpg and power gains available there (but the cost doesn't always offset the mpg difference).
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD
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12-08-2017, 02:54 PM | #4 |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,265
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Re: Poor Fuel Economy - Advice?
You need to find someone that can alter the factory tune settings. I talked to my buddy's son about one of the programmers for a friends pickup. He said he didn't think much of them, a proper tune would likely yield better results, especially for the $$$. Diablo Motorsports was the name of the programmer I believe. My buddies 2008 5.3 4 door 2WD gets 17 MPG, he was hoping for better. He has not yet done anything.....
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12-10-2017, 02:17 PM | #5 |
Registered User
Join Date: Aug 2013
Location: new glasgow
Posts: 89
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Re: Poor Fuel Economy - Advice?
I live in Canada my 2005 GMc with a 6.0 eats gas in winter 24 to 100liters all the time
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01-06-2018, 09:57 AM | #6 |
Registered User
Join Date: Mar 2015
Location: Michigan
Posts: 47
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Re: Poor Fuel Economy - Advice?
My wife's 2005 gmc Yukon, my 2500 hd, and our old 2005 gmc all seem to get horrible mileage in the winter.
13 mpg is not bad for the cold months at all, that's about what I average over all. |
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