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  1. #1

    Default 2012 silverado MPG help!


    I just purchased a 2012 silverado 1500 crew cab 5.3l with the 6 speed transmission 3.08 gears. This truck is listed as getting 15c/21hw mpg.. I have had the truck 3 weeks now and i'm averaging is 12.8 mpg.. pretty disappointed as I was expecting to average 17-18 mpg...

    My driving consists of both highway and city, some traffic. But I noticed just setting my foot on the gas at ALL to accelerate I get instant fuel economy of like 3-4mpg... and I mean even slight acceleration...

    I almost think something is wrong, so I was hoping to get community insight.. by the way this was a brand new truck.


  2. #2

    mfleetwood's Avatar
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    Jul 2010
    Denver, CO
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    It's pretty common for the DIC to drop your MPGs like that when accelerating....just like it's common for it to hit 99 mpg when decelerating. With that being said though, your average overall mileage does seem low. You may want start by checking some of the items listed in the thread below (i.e. tire pressure, excess weight, faster highway speeds such as 80mph vs 65mph, etc.).

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  3. #3


    I've got essentially the same truck, when new 6 months ago it got around 15/16 avg (increased to 19avg now).
    One difference I see is your gearing, what size tires are you running?

  4. #4


    I bet if you had the 3.42 gearing your mileage would be better. If you were to put bigger tires on it you can exepct it to get much worse.

    2011 GMC SIERRA CREW CAB 2WD W/5.3

    Convenience Package
    : Adjustable Pedals, Remote Start, Electric Rear Window Defogger, Rear Parking Assist

    Power Tech. Package| Volant CAI| GMC Upgraded Grill| Line-X Premium Bedliner| AVS Smoke Headlight Covers| Demolded| AMI Black Grill Emblem| AMI Black Rear Emblem| EGR In-Channel Window Visors| IPCW Third Brake Light| IPCW LED Fiber Optic Tail Lights| IJDM Dome & License Plate LED's| Flowmaster Exhaust W/ 3" Black Chrome Tips| OEM 20" Rims W/ Goodyear Eagle LS2

    You can't get away from the STORM!

  5. #5


    I can not believe that they put 3.08's in the trucks. Im disappointed with the 3.42's with 35" tires that were on my truck when I bought it new and can not imagine having that gearing. I did increase in mpg from 11 to 13 after I got about 4200 miles though. I would be willing to bet your average will increase 2 to 3 mpg. I wouldnt plan on any larger tires though unless you do some gear changes.

    2011 Silverado CrewCab 5.3L*Ram Air Look Cowl Induction Reflexxion Hood*6" Pro Comp Lift*Flowmaster Dual exhaust*Perfect Launch Rear Diff. Cover*Led Smoke Taillights*L.E.D.Smoke 3rd Brakelight*60" L.E.D. Tailgate Bar*Rearview Mirror Reverse Camera and Sensors*Smoke Headlight Covers*Front Bumper Grill Insert*Deezee Black Alum. Diamond Rail covers*20" Ultra Motorsports Rims wrapped with 35.5"B.F. Goodrich Tires*Inchannel Raingaurds*CAI*Bullydog GT Tuner*Alpine Amp*Boss 6x9's*Boston Acoustic Subs*Terrantula Tweeters*Custom Sub box*Red Led Interior Accents*5% Ultimacool duo tint rear window and doors, 20% front doors*Custom Vinyl Graphics*Demolded*Debadged*Painted drums and calipers*
    Future Mods Include: Custom Interior Hydrographics, Electronic Rollup Toneau Cover, 4.56 Gears, Painted rear bumper

  6. #6


    I sold my 2010 truck with the 5.3L. I drove over 100,000 miles in it, and never got better than 16 on the highway, no matter what I did. Couldn't afford to keep driving it.
    89 K Blazer 4" lift 35x12.5x15, warn hubs, cut out flares. Soon to have headers, posi carriers, gears.
    2000 K2500 Crew Cab 5.7 285/75R16's. 3" Body lift. Suspension parts being ordered.
    Lots more to do on both the trucks

    And a bunch of fast Buicks

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