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Members Helping Members help Buying a non Pontiac item, transportation help, Handy-man advice, directions, vacation ideas, places to dine, ebay and generally anything you think might help other members. |
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#1
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I'm looking at used trucks. what are the fuel mileages with the 5.3 and the 6.0. found a real nice 2001 2500hd Silverado with the 6.0. this would be 4x4 trucks. thanks
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2007 Norwalk Quick 16 Winner 8.960 @152.24 8.96 dial http://www.youtube.com/watch?v=8HY_nJR9Aa0&NR=1 |
#2
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I have a 2002 Sierra Denali with 6.0, 4:10 gears and full time AWD. I think my lifetime economy is around 13. Gets around 8 pulling an enclosed trailer. Without the AWD a friend got about 2mpg better on the highway towing. Just highway driving, just under 20 is possible for me.
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'04 GTO Yellow Jacket, A4, Kooks, CAI, etc. '02 Firebird, V6, auto '68 GTO Convertible, HO, 4spd, driver '66 LeMans Hardtop, 400, FI, A/C, 4L80E. '64 GTO Hardtop, "389", Tri-power, 5 speed, A/C, Yorktown Blue. http://www.gtoaco.com |
#3
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2002 Tahoe 5.3 l
200000 miles +- And been averaging 13 mpg since new. Steve
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462 Yc Block, zero deck Probe forged pistons 6cc relief, Scatt Hbeam rods floating pins aprox. 10.21 CR Comp Hyd-roller cam,roller lifters,springs ect. 236 244@ .050 108 LSA .511 lift, duration 289,297 @.oo6 Edelbrock Aluminum 87cc round port heads Larger valves ,ported polished and cut Powerjection3,T2 manifold, Try-y’s Flowcooler water pump. 71 formula with TKO600,hydraulic clutch 3.42 posi and 26 inch tire. 17x9 YO Honeycombs with Nitto 555's |
#4
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My 2004 2500HD ext cab, 6.0 w/4:10 gears gets 13-14 empty on the highway. About 10 pulling an open car trailer loaded, 8 pulling a 24' enclosed trailer loaded.
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#5
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2006 Silverado Crew cab 2500 4x4, 3.73 gears. Duramax diesel. Cold air intake and 4' exhaust. 19-21mpg empty on the interstate at 65-70mph. 16 MPG w/ flat 18' trailer with 4 ATV's. 11-13mpg w/ 24' enclosed trailer loaded. I know it's not the gas motor but something to think about. I traded my 5.3 in because it worked pretty hard to pull the 4 ATV's at interstate speeds and I did not want to destroy the engine/trans/ so went with the diesel and have not looked back. would rather have the durabilty and pay extra for the gas.
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#6
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2007 Norwalk Quick 16 Winner 8.960 @152.24 8.96 dial http://www.youtube.com/watch?v=8HY_nJR9Aa0&NR=1 |
#7
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Owned many 5.3 Yukon XLs with 3.73 and one '01 Sierra 2500 HD with 4.10 and 6.0. All 4wd none with the AWD.
I could get 19 on the Hwy in the Yukons at 75. I recently got 15 with my Sierra on a long trip with a complete rear end and some other parts in the bed, but prior to that it was always 12-13. There are some valve train issues with the '01 6.0s
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"If you do everything you'll win" -LBJ 13 Smiles per Gallon: 66 Bonneville wagon 66 Bonneville 2d HT - In perpetual progress |
#8
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My 99' 2500 with the 6.0 got 16 MPG rural driving. It had 3.73's.
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![]() 71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
#9
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I hear you--I bought my Sierra 5.3 4wd in '09 new because used truck prices were ridiculous.
I too would like a diesel, but that payment ain't about to happen. Mine has the Active Fuel Management and will do the claimed 20mpg highway on a trip, but mixed commuting is like 15, and towing 6000lbs gets 10-11. This is still with the old 4-speed tranny. I am actually looking at getting into an old truck with no computers, like a '70-72 C10. I'm afraid of what the next failed sensor or black box is going to cost me. Been happy with the truck, but I think the total cost of ownership over the planned 20 years will be too high. Remember that when thinking about sacrificing a couple mpgs: Reliability. |
#10
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The AFM is trouble, pure and simple. I have a 2013 Sierra with the 5.3, and at 1500 miles, I bought a Diablosport Intune, and got rid of the annoying AFM, and have not experienced any loss of MPG. I have a V8 all of the time, which is exactly what I want from it! In good weather, I have averaged over 16 MPG. Right now with the remote starting and cold weather, just below 15MPG average, and I drive in hilly territory. I bought this truck a few months ago for under $29k. It stickered for $40k.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4 ![]() 2019 Canyon SLT Crew 4X4 ![]() |
#11
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Story on '07. We had an '07 5.3 XL and planned on keeping it forever. Liked the truck a lot. Well, in '11 after putting over 100k on it, began using some oil. I was changing plugs and noticed that there was oil in 4-5 holes. Ran Mob. 1 in it from new and changed on religious schedule. Buh bye. That had the AFM on it and would only get max 15-16 MPG. If I am not mistaken, they went to all electric fans etc. on that truck too, and it still got WORSE mileage than the '01 & '02 versions we had that IIRC had mechanical fans and non AFM engines for sure. Identical driving conditions. WTF? '01-02 were good years for these trucks.
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"If you do everything you'll win" -LBJ 13 Smiles per Gallon: 66 Bonneville wagon 66 Bonneville 2d HT - In perpetual progress |
#12
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Will get poor mileage. Do not purchase if that's a concern.
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'68 GTO 4-spd Hardtop (11) '68 GTO Convertible AT (1) '70 LeMans Sport Land of Lakes Muscle Car Classic Facebook Event Facebook Wall (Kurt Smith,Minneapolis) |
#13
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Speed kills!
Anything above 60 is eating more fuel. The 6.0 can get 18 if you drive like an old woman, but who has time for that. ![]() Doesn't matter what gearing or transmission you have, as speed goes up the aerodynamic forces will hurt your MPG. |
#14
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4 ![]() 2019 Canyon SLT Crew 4X4 ![]() |
#15
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'99 GMC 1500 4x4 5.3L 3.73s 225k miles.
It lives at 7500 ft. 85 octane fuel. I get 16ish city and 21ish Highway empty. Chris
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Cum Catapultae Proscriptae Erunt Tum Soli Proscripti Catapultas Habebunt. |
#16
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My 2wd 2005 had 5.3 4psd auto-3:73's got about 16 average.Extend cab 8' bed with cap.Actually from checking mpg. towing from Latrobe to Norwalk twice with the 05 then my 11(same except 3:08's and 6spd) the 05 seemed more powerful and better alround mpg at least for our hills in W-Pa.
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#17
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Jim, Something else to look out for on this vintage of GM trucks is rusted out brake/ fuel lines. Even living in the Southern States doesn't help, I was surprised to see how rusted the brake & fuel lines on my truck were even though we're not in the snow/salt/rust belt down here. The puddle of brake fluid on my driveway tells me I'll be ordering up the "new" line kit they have this week.
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#18
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Been there, done that. The brake lines on my '02 rusted out at 70K mi, 10 years old. Junk metal.
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'04 GTO Yellow Jacket, A4, Kooks, CAI, etc. '02 Firebird, V6, auto '68 GTO Convertible, HO, 4spd, driver '66 LeMans Hardtop, 400, FI, A/C, 4L80E. '64 GTO Hardtop, "389", Tri-power, 5 speed, A/C, Yorktown Blue. http://www.gtoaco.com |
#19
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For some reason 6.0's don't get near as good as 5.3's.
Guys here say they avg 11-12 with 6.0's(13-14 on a good day). 5.3's 16-18. My 99 K1500 5.3 with 3.73's, heavy cap and 60-70 lbs in 6.5 bed, 1/2 worn GY Wranglers gets 16-18 avg back and forth to work. Don't push it hard cause cant beat traffic and lights anyway(14 miles @ 55-60 mph, 12-14 lights depending on route). Just this Thanksgiving, got 22-23 on highway(60-65 mph, some 70) to KY(5.5 hrs) and back w/4 adults and 1 child, and bed packed full of cloths, food, etc. When pull'n 3450lb car on open trailer, bed full, 3 adults to Norwalk @ 65-70 mph, get same 22-23. But again, don't hurry cause it's a 5 hr drive.
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If you cant drive from gas pump to gas pump across the map, its not a street car. http://s207.photobucket.com/albums/b...hop/?start=100 |
#20
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The rear brake line went on mine at 90K.
I just cut out as much as could and made/rerouted a new line w/o drop'n fuel tank. Hardest part was get'n at the top/front of the control module w/a 90 degree bend. Found out after GM has a service bulletin on 99-02's. All 5 lines in a kit pre bent for only $110 retail. Had known that would of got that even though fronts still look fine.
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If you cant drive from gas pump to gas pump across the map, its not a street car. http://s207.photobucket.com/albums/b...hop/?start=100 |
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