GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 Last Post byLast Post by
Results 1 to 10 of 17
  1. #1

    Default New to site with two bi-fuel CNG GM vehicles

    Nice site.

    I have two Chevy vehicles that are bi-fuel. They run on compressed natural gas (CNG) and gasoline. Both are factory installed conversions - 2003 Chevy Cavalier and 2003 C2500HD Silverado. I will be searching around for some questions that I have. If I can't find the answers already posted, then I will definitely ask.

    Thanks for the site.

  2. #2


    Welcome to the club.

  3. #3

    Red Z71 Max's Avatar
    Join Date
    May 2011
    Myrtle Beach, SC
    Blog Entries


    Welcome from Myrtle Beach, SC

    (Scott) Myrtle Beach, SC
    January 2012 ROTM WINNER
    2011 GMC Sierra Z71 MAX 6.2 L w/ Trailering Package
    Rough Country, XD Rockstars, Nitto Trail Grapplers, N Fab, Lund Genesis, Putco, Gator Grip,
    Flowmaster 40 series, Diablosport InTune, Banks Ram Air CAI,
    WeatherTech, AVS Aeroskin, Tow Mirrors,

  4. #4


    Welcome aboard. Let's see some pics.
    2009 GMC Sierra 5.3L running on E85
    Black and chrome
    Volant CAI
    Borla dual exhaust
    Chrome Billet grill
    Tonneau cover
    4300k High/Low Beam HIDs
    Westin Ultimate Bull Bar with PIAA 540s
    Blacked-out tail and third brake light

  5. #5


    Welcome to the club! I don't know much about CNG engines but I have seen and done light work on some. Take some pics and check out some groups or start one while your there. You could make your own for CNG vehicles or join some groups. Hope you enjoy your time here!

    -Tom K.
    1995 C1500 4.3L 2WD. JET TBI Spacer, JET stage 1 chip, 10mm Taylor custom wires, Pulstar Iridium Pulse Plugs.
    260k miles and still going strong...

  6. #6
    murdog94's Avatar
    Join Date
    Feb 2008
    Cloquet, Minnesota, United States
    Blog Entries


    Welcome aboard!


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  7. #7


    How is your mileage?!

    2006 Duramax LBZ
    Edge Evo
    4'' Diamond eye to 6'' tip
    16'' ion alloy, 33'' fierce attitudes
    Lots of work left to do!

  8. #8


    Welcome to the site from So California
    Dave V. -- Riverside, California
    Owner of --
    2008 Chevrolet Silverado 1500 4.8Liter V8 engine 2WD w/Kenwood Double DIN CD/DVD Player
    1971 Chevrolet Chevelle 350ci V8 engine with 500+ horsepower (Still Under Construction)

  9. #9


    Quote Originally Posted by ntbush83 View Post
    How is your mileage?!
    There are two ways to answer that question:

    1. Miles per gallon - First of all, CNG is a gas not a liquid so the term gallon does not really have any meaning. The correct term is Gasoline Gallon Equivalent, or GGE, see link:
    CNG's optimum compression ratio is about 15:1, much higher than gasoline. Since my vehicles are bi-fuel they are tuned to run on the compression ratio of gasoline (8:1 or 9:1). I therefore have a slight reduction in power and torque when on CNG. The mileage is about the same at highway speeds, but in stop and go traffic and city traffic my mileage is less. Here are my estimates on mileage:

    Cavalier - Gasoline: 80% highway and 20% city - 30 MPG
    CNG: 80% highway and 20% city - 28 - 29 MPGGE
    Silverado - Gasoline: 50% highway and 50% city - 14 MPG
    CNG: 50% highway and 50% city - 12 MPGGE

    2. Cost per mile - This is dependent on the price of gasoline versus the price of CNG. Gasoline prices changes almost everday and depending on how the CEO of OPEC feels it goes up or down. CNG is much different. It is an American fuel and, at least in Utah, takes an act of the Public Service Committee to change the price. Right now gasoline is at $3.67/gal and CNG at $1.27/gal. So, lets take my Cavalier at 30 MPG and 28.5 MPGGE for example. On gasoline it costs me $0.12 per mile. On CNG it costs me $0.04 per mile. That is a savings of $0.08 per mile. So while on CNG, my gasoline equivalent mileage is ~87 MPG.

    2003 Bi-Fuel 2500HD CNG/Gasoline (equivalent 40 MPG)
    2003 Bi-Fuel Cavalier CNG/Gasoline (equivalent 90 MPG)
    2011 Traverse

  10. #10


    Welcome to the club!!!
    Go-Recon "xtreme" amber scanning tail gate light strip, Cobra ultra2 CB radio W/ 4 foot firestix antennas, dual exhaust with 40 series single in dual out muffler, 305/65R17 Mickey Thomson Baja ATZ on 17 inch Mickey Thompson Side Biters, 3 inch body lift

    "when the going gets tough the tough get cyclic:fighting0019:"
    "use the force luke:fighting0040:"

Page 1 of 2 12 Last Post byLast Post by

Similar Threads

  1. Used vehicles/project vehicles for sale
    By tbplus10 in forum General Classifieds
    Replies: 12
    Last: 04-25-2011, 06:13 PM
  2. Replies: 0
    Last: 01-16-2010, 11:30 PM
  3. GM Certified Used Vehicles Enhances Online Shopping with New Web Site
    By ChevyFan in forum The Coffee Shop ~ Chit Chat
    Replies: 0
    Last: 05-30-2007, 09:30 AM
  4. Pump-busters: Most fuel-efficient vehicles
    By ChevyFan in forum The Coffee Shop ~ Chit Chat
    Replies: 0
    Last: 05-13-2007, 03:48 PM
  5. Pump-busters: Most fuel-efficient vehicles
    By ChevyFan in forum The Coffee Shop ~ Chit Chat
    Replies: 0
    Last: 05-08-2007, 01:22 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts