1985 GMC C15 Suburban 2WDFuel Economy & MPG Ratings
Diesel Special Purpose Vehicle 2WDRear-Wheel Drive
City
15
MPG
Highway
22
MPG
Combined
18
MPG
Trim Comparison
Automatic 4-spd
Diesel Diesel
City
15
Hwy
22
Comb
18
Fuel cost: $4,700/yr
Automatic 4-spd
Diesel Diesel
City
15
Hwy
22
Comb
18
Fuel cost: $4,700/yr
Automatic 4-spd
Regular
City
12
Hwy
16
Comb
14
Fuel cost: $4,800/yr
Automatic 4-spd
Regular
City
11
Hwy
16
Comb
13
Fuel cost: $5,200/yr
Automatic 4-spd
Regular
City
11
Hwy
15
Comb
12
Fuel cost: $5,600/yr
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic 4-spd | Diesel Diesel | 15 | 22 | 18 | $4,700 |
| Automatic 4-spd | Diesel Diesel | 15 | 22 | 18 | $4,700 |
| Automatic 4-spd | Regular | 12 | 16 | 14 | $4,800 |
| Automatic 4-spd | Regular | 11 | 16 | 13 | $5,200 |
| Automatic 4-spd | Regular | 11 | 15 | 12 | $5,600 |
Annual Fuel Cost
$4,700
Based on gasoline at $3.67/gal, 15,000 miles/year
5-Year Fuel Savings
$-11,500
vs. average new vehicle
EPA Fuel Economy Score: -1/10
GHG Score: -1/10
Environment
- CO₂ Tailpipe Emissions
- 566 g/mile
- Annual Petroleum Consumption
- 19.8 barrels
Specifications
- Engine
- 6.2L 8-cyl
- Transmission
- 4-speed Automatic
- Drivetrain
- RWD
- Body Style
- Special Purpose Vehicle 2WD
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
- Fuel Type
- Diesel
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
National AvgEPA default
$4.490/gal$3,742/yr
California
$5.957/gal$4,964/yr
Texas
$3.888/gal$3,240/yr
Florida
$4.136/gal$3,447/yr
New York
$4.522/gal$3,768/yr
Ohio
$4.510/gal$3,758/yr
Washington
$5.591/gal$4,659/yr
Colorado
$4.618/gal$3,848/yr
Minnesota
$4.344/gal$3,620/yr
Massachusetts
$4.448/gal$3,707/yr
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $3,742/yr | — |
| California | $5.957/gal | $4,964/yrHIGHEST | +$1,222 |
| Texas | $3.888/gal | $3,240/yrLOWEST | $-502 |
| Florida | $4.136/gal | $3,447/yr | $-295 |
| New York | $4.522/gal | $3,768/yr | +$26 |
| Ohio | $4.510/gal | $3,758/yr | +$16 |
| Washington | $5.591/gal | $4,659/yr | +$917 |
| Colorado | $4.618/gal | $3,848/yr | +$106 |
| Minnesota | $4.344/gal | $3,620/yr | $-122 |
| Massachusetts | $4.448/gal | $3,707/yr | $-35 |
Calculated at 15,000 miles/year (EPA standard assumption) using 18 MPG combined. Regular gasoline prices. Actual costs vary.
Related
GMC C15 Suburban 2WD MPG History
See how this model's fuel economy changed by year