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#1
03-12-2006, 10:34 PM
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12 mpg is this normal for a 02 5.3
I just bought a 02 Sierra Z71 w/71000 miles the first 2 tanks Ive averaged 12mpg. This seems pretty bad. Ive got a 01 suburban that has always gotten 17mpg. Can you have a code w/ no service engine light? Thought maybe a O2 sensor might be bad. Thanks for the help.
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#2
03-12-2006, 10:54 PM
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Re: 12 mpg is this normal for a 02 5.3
Should get at least 17mpg same as your burb.
I would start and change out the air filter, fuel filter and spark plugs...then take it in to a dealer and ensure everything else is up to snuff..ie: timing, clean injectors.. etc. Mines a 05 Z71 with 4.10 gears/5.3L auto and it gets a consistent 23mpg (cdn) highway at 110kph.
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#4
03-13-2006, 09:38 AM
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Re: 12 mpg is this normal for a 02 5.3
Does seem kinda low i have the exact same truck and i am getting about 17 mpg as long as i keep my foot out of it. i agree with tykrz start with a good tune up and i assume you are driving without flooring it at each stop sign.
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2002 Z71 ext. cab LT trim badgeless Rhino spray in liner Stock for now, other than free mods future plans (how far in the future depends on wallet) Toyo Open Country M/T's air intake (not sure which yet) exhaust system (seems that Magna flow is the ticket) Nelson tune 3 or 4 inch lift
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#5
03-13-2006, 06:51 PM
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Re: 12 mpg is this normal for a 02 5.3
lowest i ever got was around 15mpg in my 02 silverado 4.8... Then i kept getting 17 mpg after awhile i change my driving happens. When i start from a redlight i try to keep the RPM under 2k and never try to gun it unless i have to around slower traffic to get on the interstate. Seems to work because lately i been getting around 20mpg.
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#6
03-13-2006, 06:53 PM
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Re: 12 mpg is this normal for a 02 5.3
What size tires you have?
__________________
 Cranked Bars Silverstar headlight + 8 Light Mod TrueFlow Intake + Airaid TBS 5% Window Tint + 30% On Front Windshield Billet Grill + Bugshield + Ventvisors And Still Spending
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#7
03-13-2006, 10:44 PM
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Re: 12 mpg is this normal for a 02 5.3
thats about what i get also. i have the 4:10 gear though. i will get 14 in the summer. less idling and stuff (michigan winters are cold). i'm not sure if the gas blends change with the seasons around here anymore, maybe that has something to do with it if they do.
i asked my mechanic at my last oil change to check the spark plugs and he said they are fine. i have 49,000 on it and he said he wouldn't worry about them for another year.
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#8
03-13-2006, 11:14 PM
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Re: 12 mpg is this normal for a 02 5.3
I've got 285/75 tires. I had it hooked up to a scanner today but he said everything looked fine. I did forget to consider that I was actually covering more miles than the odometer indicated because of my tires. I dont know how much difference that makes but it will help my average some. Im not an aggressive driver at all. I just ease around.
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#9
03-13-2006, 11:58 PM
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Re: 12 mpg is this normal for a 02 5.3
i do 75 % highway and 25 % city and i get about 17.5 mpg with a 5.3 not sure about my gears and all but...
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2002 CHEVY SILVERADO more pics at http://www.cardomain.com/ride/2228127     more pics at http://www.cardomain.com/ride/2228127
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#10
03-14-2006, 02:55 PM
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Re: 12 mpg is this normal for a 02 5.3
A suburban is more aerodynamic than a Silverado, and unloaded, will (should) get better mileage. My '02 was getting ~12 MPG before I got my Nelson Tune, and now I get ~14.5
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   "When I step on the gas, I want people to think the world is coming to an end!" - Homer Simpson 2002 ECSB, Nelson Tune, LS1 electric fans, 145A alternator, K&N FIPK, 160º T-stat, TB coolant bypass, Corvette servo, 4 headlight mod, blue LED gauge cluster
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