2004 Chevrolet Silverado 2500 HD 2WD CNGFuel Economy & MPG Ratings
Gasoline Standard Pickup Trucks 2WDRear-Wheel Drive
City
9
MPG
Highway
11
MPG
Combined
10
MPG
Real-World MPG
Based on 4 owner reports via EPA fueleconomy.gov
11.4MPG average+14.0% vs EPA label
EPA combined: 10 MPG · Owner reported avg: 11.4 MPG
Range: 9–15 MPG
Driving mix: City 53% / Highway 48%
Source: EPA fueleconomy.gov “Your MPG” owner submissions. Real-world results vary by driver behavior, conditions, and equipment.
Owner reported MPG for this vehicle averages 11.4 real world MPG based on 4 owner reports. EPA combined rating is 10 MPG.
Trim Comparison
Automatic 4-spd
CNG CNG
City
9
Hwy
11
Comb
10
Fuel cost: $4,450/yr
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic 4-spd | CNG CNG | 9 | 11 | 10 | $4,450 |
Annual Fuel Cost
$4,450
Based on gasoline at $3.67/gal, 15,000 miles/year
5-Year Fuel Savings
$-10,250
vs. average new vehicle
EPA Fuel Economy Score: -1/10
GHG Score: -1/10
Environment
- CO₂ Tailpipe Emissions
- 703 g/mile
- Annual Petroleum Consumption
- 0.1 barrels
Specifications
- Engine
- 6L 8-cyl
- Transmission
- 4-speed Automatic
- Drivetrain
- RWD
- Body Style
- Pickup Truck
- GVWR
- Class 2-3 (6,001–10,000 lbs)
Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.
Engine & Efficiency Details
Source: EPA fueleconomy.gov
- Engine Size
- 6L, 8-cylinder
- Fuel Type
- Natural Gas
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
National AvgEPA default
$4.490/gal$6,735/yr
California
$5.957/gal$8,936/yr
Texas
$3.888/gal$5,832/yr
Florida
$4.136/gal$6,204/yr
New York
$4.522/gal$6,783/yr
Ohio
$4.510/gal$6,765/yr
Washington
$5.591/gal$8,387/yr
Colorado
$4.618/gal$6,927/yr
Minnesota
$4.344/gal$6,516/yr
Massachusetts
$4.448/gal$6,672/yr
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $6,735/yr | — |
| California | $5.957/gal | $8,936/yrHIGHEST | +$2,201 |
| Texas | $3.888/gal | $5,832/yrLOWEST | $-903 |
| Florida | $4.136/gal | $6,204/yr | $-531 |
| New York | $4.522/gal | $6,783/yr | +$48 |
| Ohio | $4.510/gal | $6,765/yr | +$30 |
| Washington | $5.591/gal | $8,387/yr | +$1,652 |
| Colorado | $4.618/gal | $6,927/yr | +$192 |
| Minnesota | $4.344/gal | $6,516/yr | $-219 |
| Massachusetts | $4.448/gal | $6,672/yr | $-63 |
Calculated at 15,000 miles/year (EPA standard assumption) using 10 MPG combined. Regular gasoline prices. Actual costs vary.
Related
Chevrolet Silverado 2500 HD 2WD CNG MPG History
See how this model's fuel economy changed by year