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Chevy Silverado and GMC Sierra Real World MPG Numbers

176 messages,  Last post on Mar 27, 2013 at 12:39 PM

You are in the Chevrolet Silverado & GMC Sierra Forum.

What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Fuel Efficiency (MPG), Truck

Messages Page 16 of 19

#145 of 176 Expected better miles per gallon? by steve_ HOST

Jul 14, 2011 (11:27 am)

A reporter wants to talk with people who expected to get better gas mileage in their relatively new vehicle. Please email predmunds.com by Tuesday, July 19, 2011 with your daytime contact information and a few words about your experience. Thank you.

#146 of 176 Re: 08 silverado lost gas mileage [gmcustsvc] by spaztikhi

Sep 02, 2011 (3:39 am)

Replying to: gmcustsvc (Mar 17, 2011 7:00 am)
2001 silverado ext cab 4x2 4.8L 1200 miles purchased new 30 days ago.
 
  
 
Round trip, Ocala florida to Orlando area. tripometer- 235 miles used a full tank + (26 gal +)
 
I had the truck to the dealer twice so far in reguards to mileage and the way it runs ** crusing, accelerate slightly, slight enough that it does not down shift and is bucks, like a miss under load, also noticed this condition when in a parking lot, slow holding steady low speed, it feels like your applying light pressure to brakes and letting off (repeating). And other possible related condition, slowing to a stop, close to stopping the truck surges like accelerator is tapped. Sometimes applying slight brake others just letting off to coast toward light. This has happened 4 to 5 times since bought. **AND YES I AM SURE I WASN'T TOUCHING THE GAS PEDAL**
 
  
 
No check engine light, dealer states it was scanned with no codes present. I noticed these things in the first week of ownership. The service advisor told me there was probbably some water in the fuel, and that I need to find a new place to fuel up ***this was the complementary tank of fuel at purchase*** and I have fueled at 5 different places since and no changes.
   
 
I feel as if I have purchased a sick, hungry St. Bernard

#147 of 176 Chevy/GMC Fuel Economy by drvette

Nov 13, 2011 (9:51 am)

My "96 4x4 Yukon w/5.7 Vortec gets upwards of 19.5 "corrected MPG at 55mph or Less using Hypermiling techniques and 45psi
 
At 75-85mph I can get 17.8mpg, with AC on
This on a vehicle with 225,000 miles AND 4x4 !
My axle is very low, speeds over 55mph cause the tach to rise rapidly.
 
A major factor is the fact I can get fuel with NO MTBE or Alcohol !
 
MTBE is mandated for townships upwind of major cities, it supposedly is an oxgenator type additive.
 
Alcohol had about 80k BTU/Gl
Gasoline has about 115k BTU/Gl
Less BTU = less energy
 
Use Hypermiling techniques when you are not in traffic situations.
Keep the air pressure at absolute MAX without causing wear issues.
Keep the oil changed.
Forget K&N Air Filters or big exhaust for fuel economy.
Use the hottest thermostat and plugs you can find.
 
Best Luck
DrVette

#148 of 176 Re: V8100 ENGINE [redwing1] by smoothoperater

Nov 13, 2011 (10:10 pm)

Replying to: redwing1 (Jan 30, 2006 9:43 am)
redwing, I had a 2500HD with the 8.1 liter engine. i got 11.00 m.p.g. in town and 12.6 on hwy. it is a real work truck. great for towing and hauling heavy loads. i dont think the mialege would change much pulling a trailer. i pulled a car trailer and couldnt tell it was there.

#149 of 176 2010 gmc lifted with 33s by live_lift

Nov 14, 2011 (8:15 pm)

I have a 2010 gmc 1500 5.3 reg cab 4x4 with a procomp 6" lift , 32.2" good year dura track tires, magnaflow cat back 2-1-2 exhaust exhaust and a edge evolution chip (only running on trans tune to firm up the shifts) i get a consistent 17.5 mpg and thats going 45-55 mph in 4x4 on some extreamly icey roads between jasper and banff about 200 kms or 135 miles and when it cleared 80 mph on a fairly straight road with little traffic still some 6% grades in there for another 350kms or 210 miles and i get about 17.5 mpg so some 550 kms on 86 litres of fuel with my heavy foot in a more than capable 4x4 17.5 mpg is is pretty damn good
 
 2009 f350 6.4 diesel drw cc gets 8mpg and my 2011 f350 6.2 gas drw cc gets about 8 mpg( im so done with diesels !!!!!! aswell and my wifes 2008 honda civic gets 48 mpg on the hwy all day long!!!!!!
 
 long story short if you want fuel economy buy a civic or similar vehicle if you wanna drive a truck be prepaired to pay more in fuel if you want cc drw 4x4 hope its making you money because thay are thirsty!!!!!!
 
i also have a 1991 s10 with a supercharged small block that gets 6 mpg on premium but runs the quarter in 12.5 at 110 mph but cant complain at paying a little extra for a good time

#150 of 176 2011 4x2 Silverado 5.3 crew cab w/ Active Fuel Mgnt. sys. by string2

Dec 23, 2011 (10:11 pm)

I now have about 5000 mi. on my Silverado. Just filled up AGAIN with 21.2 gallons of gasoline. My gauge showed 321 miles since last fill up. My Active fuel management won't work above 60-65 MPH, therefor I don't get the benefit from the Active Fuel Management at normal highway driving around 70 mph. GM has looked at it and assures me that it's operating normal dispite their misleading epa window sticker 15 city 21 highway.
 
    I get about 15 city 16 on level highway above 65 MPH. Not loaded and I don't have a heavy foot. gas - Shell, Exxon, Chevron
 
321 miles divided by 21.2 gallons gas = 15.14 MPG city miles 50% highway 50%
 
Since the Active fuel Management is not designed to work above 65 MPH on level highway, I can't get the fuel savings at the highway speed of 70 -72 MPH. I don't know why they designed it that way, but GM says that's normal. Are they lying to me ?

#151 of 176 2011 Silverado 5.3 Crew cab 3.42 rear end Low MPG by string2

Dec 23, 2011 (10:30 pm)

I now have about 5,000 mi. on my Silverado. Just filled up AGAIN with 21.2 gallons of gasoline. My gauge showed 321 miles since last fill up. My Active fuel management won't work above 60-65 MPH, therefore, I don't get the benefit from the Active Fuel Management at normal highway driving around 70 mph. GM has looked at it and assures me that it's operating normal dispite their misleading epa window sticker 15 city 21 highway.
    I get about 15 city 16 on level highway above 65 MPH. Not loaded and I don't have a heavy foot. gas - Shell, Exxon, Chevron
 
321 miles divided by 21.2 gallons gas = 15.14 MPG city miles 50% highway 50%
 
Since the Active fuel Management is not designed to work above 65 MPH on level highway, I can't get the fuel savings at the highway speed of 70 -72 MPH. I don't know why they designed it that way, but GM says that's normal. Are they lying to me ?

#152 of 176 Re: 2011 Silverado 5.3 Crew cab 3.42 rear end Low MPG [string2] by chuck1

Jan 05, 2012 (12:35 pm)

Replying to: string2 (Dec 23, 2011 10:30 pm)
Mine works at 70mph. However, after 70mph it will not come on much. I have 10,000 miles on my truck. Three trips to Utah and one to Sedona, Arizona from Southern California.
 
OVERALL mpg is showing 15mpg. I get 12 to 14 city...depending. This takes in the very short around town trips and the 20mpg I get on the highway.
 
Speeds above 70mph will net 17.5 to 18.5 w/o active fuel management coming on.

#153 of 176 Re: 2011 Silverado 5.3 Crew cab 3.42 rear end Low MPG [chuck1] by string2

Jan 05, 2012 (2:59 pm)

Replying to: chuck1 (Jan 05, 2012 12:35 pm)
OVERALL mpg is showing 15mpg. I get 12 to 14 city...depending. This takes in the very short around town trips and the 20mpg I get on the highway.
  
Speeds above 70mph will net 17.5 to 18.5 w/o active fuel management coming on.
 
Hi Chuck1
     I sure would like to get 18.5 miles on the highway without AFM. Especially if (at some future time) it would, miraculouslyly, begin to start activating the AFM at higher speeds.
My AFM, at low mileage, works okay up to about 52 MPH then drops off quickly. Past 52 it just activates for very short distances on level highway, then activates less often up to about 63 MPH. After that, it only works going down hill. I only get 16 MPG w/o AFM driving about 70-73. I get about 15 in town. GM tells me it is operating normally?
String

#154 of 176 Re: 2011 Silverado 5.3 Crew cab 3.42 rear end Low MPG [string2] by cabe227

Feb 18, 2012 (11:41 pm)

Replying to: string2 (Jan 05, 2012 2:59 pm)
Hey String, I just bought my brothers 2011 Silverado 1500 CC 4x4 5.3L flex fuel. Truck has 7,500 miles on it and same thing, active fuel management doesn't switch on unless your going down hill or slowing down. Instant Econ. gage said 12.5 on a 20 mile trip on flat straight highways at 60mph Burning E-85. Even with 89 Octane it only got 14 at 65-70 highway speed. I bought a superchips programmer and am anxious to see if a fuel map has more than a 2MPG difference. It is rocking 33s with the factory 20" rims. Wondering if you ever pinpointed the issue???

Messages Page 16 of 19

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