How many miles per gallon does a 1981 Chevy Blazer get?
Most 1981 Blazers achieve roughly 12–18 miles per gallon, depending on engine and drivetrain. Two-wheel-drive inline-sixes tend to be toward the higher end, while four-wheel-drive V8 versions sit at the lower end. Real-world results vary based on wear, maintenance, payload, and driving conditions.
A snapshot of the 1981 Blazer lineup
In 1981, the Blazer offered a range of powertrains and configurations. Common options included inline-six engines and small-block V8s, with two- or four-wheel drive and various transmissions. Because EPA testing standards and labeling differed at the time, official fuel-economy numbers aren’t as standardized as today, so most estimates come from historical data and owner reports.
Key engine and drivetrain options
Typical configurations that influenced fuel economy include:
- 4.1L inline-six (250 cu in), 2WD
- 4.1L inline-six, 4x4
- 5.0L (305 cu in) V8, 2WD
- 5.0L V8, 4x4
- 5.7L (350 cu in) V8, 4x4
Notes: Engine availability and gear ratios varied by model year and trim, so exact mpg for a given truck depends on the specific configuration and maintenance history.
Typical mpg ranges by configuration
Below are approximate miles-per-gallon ranges for common 1981 Blazer setups, based on historical data and owner experience. Real-world results vary with condition and driving style.
- 4.1L I6, 2WD: roughly 15–17 mpg city, 20–22 mpg highway (combined around 18–20)
- 4.1L I6, 4x4: roughly 12–14 mpg city, 15–18 mpg highway (combined around 14–16)
- 5.0L V8, 2WD: roughly 14–15 mpg city, 18–20 mpg highway (combined around 16–18)
- 5.0L V8, 4x4: roughly 12–14 mpg city, 16–18 mpg highway (combined around 14–16)
- 5.7L V8, 4x4: roughly 12–13 mpg city, 16–18 mpg highway (combined around 14–15)
These ranges illustrate the general pattern: larger V8s and 4x4 drivetrains lower efficiency, while the inline-six in two-wheel-drive configurations tends to be the most economical among Blazer setups of that era.
Factors that affect mpg on a vintage Blazer
Fuel economy for a 40-year-old vehicle hinges on more than just engine displacement. Several factors can push mpg up or down.
- Engine health and tuning (carburetor/fuel delivery, ignition timing)
- Drivetrain configuration (2WD vs 4x4) and transfer-case operation
- Tire size, inflation, aerodynamics, and overall weight from payload
- Maintenance history, including tune-ups, spark plugs, air filter, and oil changes
- Terrain and driving style (highway cruising vs stop-and-go city driving)
Keeping these factors in check can improve efficiency somewhat, but gains are naturally limited by the vehicle’s age and design.
Tips to maximize fuel efficiency in an older Blazer
Even with limited tech, a few practical steps can help marginally improve efficiency today.
- Maintain proper tire pressure and wheel alignment
- Perform regular tune-ups and carburetor adjustments; replace worn spark plugs
- Lighten payload; remove unnecessary racks or roof cargo
- Avoid prolonged idling and aim for steady cruising speeds when possible
- Use the recommended fuel grade and keep fuel delivery components clean
While improvements may be modest, these practices can help a vintage Blazer run more efficiently on today’s roads.
Summary
In essence, a 1981 Chevy Blazer’ s fuel economy depends on the exact engine and drivetrain. Typical combined figures hover around 14–18 mpg, with 4x4 V8 models tending to be lower and 2WD inline-sixes tending to be higher. For a precise figure, identify the specific configuration and review maintenance history and driving conditions, as these greatly influence real-world results.
