1984 GMC K15 Suburban 4WDFuel Economy & MPG Ratings
Diesel Special Purpose Vehicle 4WD4-Wheel or All-Wheel Drive
City
15
MPG
Highway
20
MPG
Combined
16
MPG
Trim Comparison
Automatic 4-spd
Diesel Diesel
City
15
Hwy
20
Comb
16
Fuel cost: $5,300/yr
Automatic 4-spd
Diesel Diesel
City
15
Hwy
20
Comb
16
Fuel cost: $5,300/yr
Automatic 4-spd
Regular
City
11
Hwy
14
Comb
12
Fuel cost: $5,600/yr
Automatic 4-spd
Regular
City
11
Hwy
14
Comb
12
Fuel cost: $5,600/yr
Manual 4-spd
Regular
City
10
Hwy
12
Comb
11
Fuel cost: $6,150/yr
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic 4-spd | Diesel Diesel | 15 | 20 | 16 | $5,300 |
| Automatic 4-spd | Diesel Diesel | 15 | 20 | 16 | $5,300 |
| Automatic 4-spd | Regular | 11 | 14 | 12 | $5,600 |
| Automatic 4-spd | Regular | 11 | 14 | 12 | $5,600 |
| Manual 4-spd | Regular | 10 | 12 | 11 | $6,150 |
Annual Fuel Cost
$5,300
Based on gasoline at $3.67/gal, 15,000 miles/year
5-Year Fuel Savings
$-14,500
vs. average new vehicle
EPA Fuel Economy Score: -1/10
GHG Score: -1/10
Environment
- CO₂ Tailpipe Emissions
- 636 g/mile
- Annual Petroleum Consumption
- 22.3 barrels
Specifications
- Engine
- 6.2L 8-cyl
- Transmission
- 4-speed Automatic
- Drivetrain
- AWD
- Body Style
- Special Purpose Vehicle 4WD
Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.
Engine & Efficiency Details
Source: EPA fueleconomy.gov
- Engine Size
- 6.2L, 8-cylinder
- Induction Type
- (DIESEL)
- Fuel Type
- Diesel
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
National AvgEPA default
$4.490/gal$4,209/yr
California
$5.957/gal$5,585/yr
Texas
$3.888/gal$3,645/yr
Florida
$4.136/gal$3,878/yr
New York
$4.522/gal$4,239/yr
Ohio
$4.510/gal$4,228/yr
Washington
$5.591/gal$5,242/yr
Colorado
$4.618/gal$4,329/yr
Minnesota
$4.344/gal$4,073/yr
Massachusetts
$4.448/gal$4,170/yr
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $4,209/yr | — |
| California | $5.957/gal | $5,585/yrHIGHEST | +$1,376 |
| Texas | $3.888/gal | $3,645/yrLOWEST | $-564 |
| Florida | $4.136/gal | $3,878/yr | $-331 |
| New York | $4.522/gal | $4,239/yr | +$30 |
| Ohio | $4.510/gal | $4,228/yr | +$19 |
| Washington | $5.591/gal | $5,242/yr | +$1,033 |
| Colorado | $4.618/gal | $4,329/yr | +$120 |
| Minnesota | $4.344/gal | $4,073/yr | $-136 |
| Massachusetts | $4.448/gal | $4,170/yr | $-39 |
Calculated at 15,000 miles/year (EPA standard assumption) using 16 MPG combined. Regular gasoline prices. Actual costs vary.
Related
GMC K15 Suburban 4WD MPG History
See how this model's fuel economy changed by year