1985 GMC S15 Pickup 2WD: MPG and fuel economy
The 1985 GMC S15 Pickup 2WD is rated by the U.S. Environmental Protection Agency at 28 combined MPG, with 26 MPG in the city and 31 MPG on the highway. That puts it well above the average for cars in the Small Pickup Trucks class in the same model year.
This page collects every fuel-economy figure the EPA publishes for the 1985 GMC S15 Pickup 2WD. Below you will find the headline combined, city, and highway MPG, the estimated annual fuel cost at three different driving levels, the tailpipe CO₂ emissions, and a full breakdown of the engine and drivetrain. The EPA rates 14 separate variants of this car (different engine, transmission, or drivetrain combinations), and you can compare them side by side in the trims table. If you want to know whether this generation got more or less efficient over the years, the year-over-year table further down covers every model year the EPA has rated.
Key takeaways
- Returns 28% better combined MPG than the average car in the Small Pickup Trucks class for the 1985 model year (21.9 MPG class average).
- The GMC S15 Pickup 2WD has lost 7 MPG since its first rated model year, the 1984 GMC S15 Pickup 2WD at 29 MPG. That is often a sign of larger engines or heavier curb weights in newer generations.
- EPA estimates this car costs around $3,750 more in fuel over five years than an average new vehicle of the same model year.
Fuel economy at a glance
These are the EPA's official ratings for the 1985 GMC S15 Pickup 2WD. The numbers come from a standardised laboratory test cycle and are the same figures that appear on the window sticker of every new car. Real-world mileage varies with driving style, weather, fuel quality, and how heavily loaded the car is.
When the EPA tests several variants of the same nameplate (for example, a front-wheel-drive version and an all-wheel-drive version), each gets its own rating. The figures shown here are the headline variant, taken as the configuration with the best combined MPG. The trims table further down covers all 14 variants side by side.
Combined MPG is a 55/45 weighted blend of the city and highway test cycles. The EPA uses it as the single number you can compare across the entire dataset, including hybrids and EVs (which use the equivalent MPGe figure).
| Combined MPG | 28 MPG |
| City MPG | 26 MPG |
| Highway MPG | 31 MPG |
| Annual fuel cost | $2,900 |
| Tailpipe CO₂ | 364 g/mi |
| Fuel type | Diesel |
How the 1985 GMC S15 Pickup 2WD compares
The 1985 GMC S15 Pickup 2WD returns 28 combined MPG. Cars in the Small Pickup Trucks class for the same model year average 21.9 MPG, which puts this car ahead of the class average by about 28%.
For broader context, the average new car of the 1985 model year (across all classes) returns 19.7 MPG. Larger vehicles pull the all-cars average down, so do not use that figure on its own to judge a small car or a hybrid. The full list of the most efficient cars of the 1985 model year is on its own page.
Trim variants rated for 1985
The EPA rates 14 separate variants of the 1985 GMC S15 Pickup 2WD. The differences come from the engine size, transmission type, and drivetrain (front-wheel drive, all-wheel drive, and so on). The same nameplate can land several MPG apart depending on the configuration you actually buy.
The most efficient configuration on this page returns 28 MPG, while the least efficient returns 18 MPG. That is a spread of 10 MPG between trims of the same nameplate.
| Engine and transmission | Drive | Combined | City | Highway | Annual cost |
|---|---|---|---|---|---|
| 2.2L, 4-cyl, Manual 4-spd | Rear-Wheel Drive | 28 MPG | 26 MPG | 31 MPG | $2,900 |
| 2.2L, 4-cyl, Manual 5-spd | Rear-Wheel Drive | 28 MPG | 26 MPG | 33 MPG | $2,900 |
| 2.2L, 4-cyl, Manual 4-spd | Rear-Wheel Drive | 27 MPG | 26 MPG | 30 MPG | $3,000 |
| 2.2L, 4-cyl, Manual 5-spd | Rear-Wheel Drive | 27 MPG | 25 MPG | 30 MPG | $3,000 |
| 1.9L, 4-cyl, Manual 4-spd | Rear-Wheel Drive | 23 MPG | 21 MPG | 27 MPG | $2,600 |
| 2.5L, 4-cyl, Manual 5-spd | Rear-Wheel Drive | 22 MPG | 20 MPG | 26 MPG | $2,700 |
| 2.5L, 4-cyl, Automatic 4-spd | Rear-Wheel Drive | 21 MPG | 18 MPG | 25 MPG | $2,850 |
| 2.5L, 4-cyl, Manual 4-spd | Rear-Wheel Drive | 21 MPG | 19 MPG | 24 MPG | $2,850 |
| 2.8L, 6-cyl, Manual 4-spd | Rear-Wheel Drive | 19 MPG | 16 MPG | 23 MPG | $3,150 |
| 2.8L, 6-cyl, Automatic 4-spd | Rear-Wheel Drive | 19 MPG | 17 MPG | 23 MPG | $3,150 |
| 2.8L, 6-cyl, Manual 4-spd | Rear-Wheel Drive | 19 MPG | 17 MPG | 23 MPG | $3,150 |
| 2.8L, 6-cyl, Manual 5-spd | Rear-Wheel Drive | 19 MPG | 16 MPG | 23 MPG | $3,150 |
| 2.8L, 6-cyl, Automatic 4-spd | Rear-Wheel Drive | 18 MPG | 15 MPG | 22 MPG | $3,300 |
| 2.8L, 6-cyl, Manual 5-spd | Rear-Wheel Drive | 18 MPG | 15 MPG | 23 MPG | $3,300 |
Annual fuel cost across driving patterns
The headline annual fuel cost the EPA publishes assumes 15,000 miles of driving per year and a fuel mix of 55% city and 45% highway. The dollar figure is calculated using the EPA's current reference price for diesel, which is $5.40/gallon. EPA updates that reference periodically rather than tracking live pump prices, so treat it as a window-sticker estimate rather than today's pump number.
The table below scales the EPA's number to three common driving patterns. The combined MPG and the reference fuel price stay constant, only the annual mileage changes. To get a current-prices estimate, take your local gas price and multiply by 535.7 gallons (the car's annual consumption at the rated MPG).
| Driving pattern | Estimated annual fuel cost |
|---|---|
| Light driver, 7,500 miles per year | $1,450 |
| Average driver, 15,000 miles per year | $2,900 |
| Heavy driver, 25,000 miles per year | $4,833 |
Year-over-year MPG for the GMC S15 Pickup 2WD
The EPA has rated the GMC S15 Pickup 2WD across 7 model years, from 1984 GMC S15 Pickup 2WD through 1990 GMC S15 Pickup 2WD. The numbers below are the best combined MPG figure the EPA published for each year, which lets you see when the car was at its most efficient and how recent generations stack up.
The 1984 GMC S15 Pickup 2WD returned 29 MPG. The most recent 1990 GMC S15 Pickup 2WD returns 22 MPG. That is a drop of 7 MPG over 6 model years. Newer trims that grow heavier or carry larger engines tend to lose efficiency even as the rest of the lineup improves.
| Year | Combined MPG | Open year page |
|---|---|---|
| 1990 | 22 MPG | 1990 GMC S15 Pickup 2WD |
| 1989 | 22 MPG | 1989 GMC S15 Pickup 2WD |
| 1988 | 23 MPG | 1988 GMC S15 Pickup 2WD |
| 1987 | 22 MPG | 1987 GMC S15 Pickup 2WD |
| 1986 | 24 MPG | 1986 GMC S15 Pickup 2WD |
| 1985 | 28 MPG | this page |
| 1984 | 29 MPG | 1984 GMC S15 Pickup 2WD |
Compare against other Small Pickup Trucks for 1985
If you are cross-shopping the 1985 GMC S15 Pickup 2WD, the most useful comparison is against the other cars in the Small Pickup Trucks class for the same model year. The list below shows the highest-MPG peers, ranked from most to least efficient. Click any of them to open its full page.
The Isuzu Pickup 2WD leads this group at 32 MPG, 4 MPG ahead of the 1985 GMC S15 Pickup 2WD.
Specifications
The 1985 GMC S15 Pickup 2WD runs a 2.2-liter 4-cylinder engine paired with a manual 4-spd, sending power through rear-wheel drive.
Engine, transmission, and drivetrain together drive most of the variation in fuel economy across trims. A larger engine moves the car with less effort but burns more fuel. A turbo lets a small engine punch above its weight, often without much MPG penalty. All-wheel drive adds traction and weight, and usually costs a couple of MPG compared with two-wheel drive of the same engine.
- Vehicle class
- Small Pickup Trucks
- Engine
- 2.2L 4-cylinder
- Transmission
- Manual 4-spd
- Drivetrain
- Rear-Wheel Drive
- Fuel type
- Diesel
- Annual petroleum use
- 12.8 barrels per year
Common questions about the 1985 GMC S15 Pickup 2WD
Quick answers to the questions people most often search for when looking up the 1985 GMC S15 Pickup 2WD.
-
Is the 1985 GMC S15 Pickup 2WD fuel efficient?
Yes. The 1985 GMC S15 Pickup 2WD returns 28 combined MPG, which beats the average car in the Small Pickup Trucks class for the same model year by about 28%. -
What MPG does the 1985 GMC S15 Pickup 2WD get?
The EPA rates the 1985 GMC S15 Pickup 2WD at 28 combined MPG, 26 MPG in city driving, and 31 MPG on the highway. Real-world numbers depend on your driving style, the weather, and how loaded the car is. -
How much does it cost to fuel a 1985 GMC S15 Pickup 2WD per year?
The EPA estimates an annual fuel cost of $2,900 for the 1985 GMC S15 Pickup 2WD. That figure assumes 15,000 miles of driving per year, a 55% city and 45% highway split, and the EPA's published average fuel price for the rated fuel grade. -
What fuel does the 1985 GMC S15 Pickup 2WD use?
The EPA lists the 1985 GMC S15 Pickup 2WD as running on diesel. Using a different grade than the manufacturer specifies can affect fuel economy and engine longevity. -
Has the GMC S15 Pickup 2WD become more fuel efficient over time?
Combined MPG has actually slipped. The first EPA-rated GMC S15 Pickup 2WD, the 1984 GMC S15 Pickup 2WD, returned 29 MPG, while the most recent 1990 GMC S15 Pickup 2WD returns 22 MPG. A drop of 7 MPG usually traces back to bigger engines or heavier curb weights in newer trims. -
How much CO₂ does the 1985 GMC S15 Pickup 2WD emit?
Tailpipe CO₂ emissions are 364 g/mi. Multiplied across a typical year of driving (15,000 miles) that works out to about 5,454 kilograms of CO₂. -
What is the difference between the city and highway MPG of the 1985 GMC S15 Pickup 2WD?
City driving returns 26 MPG and highway driving returns 31 MPG, a gap of 5 MPG. The two figures are close enough that the car will hold its rated efficiency well across most driving patterns. -
What engine is in the 1985 GMC S15 Pickup 2WD?
The 1985 GMC S15 Pickup 2WD has a 2.2-liter 4-cylinder engine. -
What transmission and drivetrain does the 1985 GMC S15 Pickup 2WD have?
The 1985 GMC S15 Pickup 2WD comes with a manual 4-spd transmission and rear-wheel drive. -
How much more does the 1985 GMC S15 Pickup 2WD cost in fuel compared to an average car?
The EPA estimates that over five years, the 1985 GMC S15 Pickup 2WD will cost about $3,750 more in fuel than an average new vehicle of the same model year. The difference accumulates because the car uses more fuel per mile, not because of any one-off charge at the dealership.
Source: U.S. EPA fuel economy dataset. Annual fuel cost figures assume 15,000 miles of driving per year and a 55% city, 45% highway split. Real-world mileage varies with driving conditions, vehicle maintenance, fuel quality, and driver behaviour.