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  1. #11

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    1998 Chevy Silverado Ext. Cab K1500 5.7 - 12.7 MPG (50/50)
    1998 silverado 1500 4x4 - 5.7L vortec
    Bed rails, step bars, bedliner, 18% tint, flowmaster 44 muffler, 16x8 M/T Classic II wheels, 265/75-16 goodyear wrangler duratracs

  2. #12

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    1988 GMC Suburban 2wd, 3.42 rear gears, 31.5 inch tall tires. Stock motor (350) and trans(700r4). 17.5 mpg hwy at 70-75 mph. 12-14 mpg 70/30 city/hwy. Before the gear and tire change, I was getting roughly 15 hwy and 10-12 city hwy mix

  3. #13

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    2005 4.8 reg cab, short bed, 5 spd, 4X4, wt model. k&n air filter, airbox mod, flowmaster 40 series muffler w/3" pipes, 4" tips, raised 1" in front, 50/50 hwy/city driving =19.3 avg mpg!
    Last edited by devilsalmostfree; 03-30-2010 at 05:15 AM.
    Carl
    2005 GMC Sierra 1500, reg cab, 4.8 ltr, 5 spd, 4X4, Flowmaster 40 series w/3" exhaust pipes & 4" tips. ReadyLift torsion bar keys(part#66-3000), K&N air filter (soon to be getting a AFE Pro Dry S airfilter), & airbox mod .

  4. #14

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    1990 Silverado 5.7L 2wd
    13 Highway
    11 City
    Justin
    1990 Silverado Stepside



    2003 Olds Alero-
    64,XXX

  5. #15

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    2008 Silverado 4.3l V6 - 17.5 (more highway than city)
    after K&N Air Filter - 17.7
    Last edited by daweinah; 03-31-2010 at 10:23 PM.
    2008 Blue Granite W/T
    ✔ Line-X
    ✔ Leveling Kit
    ✔ K&N Air Filter
    ✔ Bed Rail Caps
    ✔ 265/70R18 Michelin LTX M/S2
    ✔ All 4 Infinity Kappa Speakers
    ✔ Sound Ordnance B-8PT Powered Sub
    ✔ JVC Arsenal KD-AHD79 Head Unit + GMOS

  6. #16
    Jr. Engineer 09Z71BLKBST's Avatar
    Join Date
    Nov 2009
    Location
    Grand Forks AFB, North Dakota
    Posts
    219
    Blog Entries
    1

    Default

    2009 Ext. cab Z71 5.3L Flowmaster 40 series- 13.1 mpg avg (mostly city)
    CHEVY TIL I DIE.
    2009 Silverado Z71 LT/5.3/Flowmaster 40 Series/Volant/Diablosport
    2006 Trailblazer 4X4 LS

    Past Rides:
    2001 GMC SIERRA 4x4 - Totaled
    99 Chevy Silverado 2x4 traded in

  7. #17

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    2007 silverado 5.3 L
    14.5mpg 80% hwy 20% country road
    loaded with work stuff and camper shell with ladders
    intake kit


    planning to get a exhaust system

  8. #18
    Jr. Mechanic csattley14's Avatar
    Join Date
    Mar 2010
    Location
    Illinois
    Posts
    92
    Blog Entries
    1

    Default

    2007 silverado 5.3L Z71 16.5 mpg with K & N filter. Mainly city at about 45 mph.

    When I got the truck it was at 15.7 avg economy and it has went up to 16.5 after K & N filter. drive mainly with a light foot on it as well.
    2007 Silverado Ext Cab Z71
    - K&N Air Filter
    - Nasta Steps
    - Penda Bedliner
    - Bug deflector and window
    - 35% tint on front windows

    Planned:
    Mudflaps
    Exhaust hopefully
    Maybe a programmer

    2008 Equinox

  9. #19

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    1989 Chevrolet Suburban R2500 454 4.10s in the rear, otherwise completely stock.

    Pure City Mileage 8MPG
    Combined Mileage 10MPG
    Highway Mileage 12-13MPG
    Heavy Towing Mileage Short Distance(IE Around Town) 9 MPG
    Heavy Towing Mileage Long Distance(IE Highway) 11MPG
    1968 Ford F100 Long Bed - Project Truck #1 360 stroked to 390.
    1991 Nissan 240SX - DD
    1998 Honda Accord LX - DD in need of transmission
    1989 Chevrolet R2500 Suburban 454 TBI Towing and Family Hauler

  10. #20

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    1995 chevy silverdo c1500 2wd stock-17mpg 50/50
    1995 chevy silverado 3in body 2 in level 33 in tires cai and dual muffler- 14mpg 50/50 winter(400+lbs. weight) we will see how it changes in summer

    2000 Chevy Silverado 2500 4x4

    6.0L v8:great: 4L80E

    2.5 in Daystar leveling keys

    285/75/16s BFG ATs on HD wheels

    Cab lights and tool box

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