2021 Jeep Gladiator MPG and Fuel Cost
The 2021 Jeep Gladiator gets up to 19 mpg combined with a gas engine and up to 24 mpg with the diesel, across 4 EPA-tested versions.
EPA fuel economy
2021 Jeep Gladiator · 4 EPA-tested versionsBest gas version
19MPG combined
16 city 23 highway
$3,300 a year to fuel15,000 miles a year at EPA's $4.00 a gallon (regular gas)
3.6L 6-cyl · 4WD · 6-speed manual
Best diesel version
24MPG combined
22 city 28 highway
$3,950 a year to fuel15,000 miles a year at EPA's $6.13 a gallon (diesel)
3.0L turbo 6-cyl diesel · 4WD · 8-speed automatic
Best version costs $8,750 more in fuel over 5 years vs the average new vehicle (EPA)
At EPA's price assumptions, fuel costs $3,300 to $3,950 a year. New for 2021: a diesel version.
More complaints than a typical Gladiator year
The 2021 drew 170 owner complaints in its first three years, against about 116 for a typical Gladiator year.
No Gladiator year stands out enough to avoid. Based on owner complaints, not adjusted for sales.
Every Gladiator year rankedThe 2021 Gladiator's recalls and problems
Every 2021 Gladiator version
EPA's ratings for each version it tested. Fuel cost is EPA's estimate for 15,000 miles a year at its current prices.
| Version | Combined | City / Hwy | Fuel / year |
|---|---|---|---|
| Gas | |||
3.6L 6-cyl · 4WD · 6-speed manual
EPA listing: Gladiator 4WD |
19 mpg | 16 / 23 | $3,300 |
3.6L 6-cyl · 4WD · 8-speed automatic
EPA listing: Gladiator 4WD |
19 mpg | 17 / 22 | $3,300 |
| Diesel | |||
3.0L turbo 6-cyl diesel · 4WD · 8-speed automatic Best
EPA listing: Gladiator EcoDiesel 4WD |
24 mpg | 22 / 28 | $3,950 |
3.0L turbo 6-cyl diesel · 4WD · 8-speed automatic · Rubicon
EPA listing: Gladiator Rubicon EcoDiesel 4WD |
24 mpg | 21 / 27 | $3,950 |
Fuel cost at your prices
EPA's annual cost uses 15,000 miles a year, 55% city driving and its current prices: $4.00 a gallon for regular gas and $6.13 a gallon for diesel. Change the numbers to match your driving.
| Version | Per year | 5 years |
|---|---|---|
3.6L 6-cyl · 4WD · 6-speed manual | $3,158 | $15,789 |
3.6L 6-cyl · 4WD · 8-speed automatic | $3,158 | $15,789 |
3.0L turbo 6-cyl diesel · 4WD · 8-speed automatic | $3,831 | $19,156 |
3.0L turbo 6-cyl diesel · 4WD · 8-speed automatic · Rubicon | $3,831 | $19,156 |
At the default settings the results match EPA's annual cost before EPA rounds it to the nearest $50.
Jeep Gladiator MPG by model year
The best-rated version in each model year; the highlighted year is this page. Gas: 19 mpg (every year from 2020 to 2026). Diesel: 24 mpg (2021 to 2023).
- Best gas version
- Best diesel version
2021: gas 19 mpg · diesel 24 mpgTap or drag across the chart for other years.
Show as a table
| Model year | Best gas version | Best diesel version |
|---|---|---|
| 2020 | 19 | – |
| 2021 | 19 | 24 |
| 2022 | 19 | 24 |
| 2023 | 19 | 24 |
| 2024 | 19 | – |
| 2025 | 19 | – |
| 2026 | 19 | – |
Every Gladiator year's ratings in one table
How the 2021 Gladiator compares
2021 midsize pickups covered on this site, ranked by their best combined rating. Fuel cost is for each model's cheapest version to run, at EPA's prices.
| 2021 model | Best combined | Best gas | Fuel / year |
|---|---|---|---|
Jeep Gladiator This page Best: diesel |
24 mpg | 19 mpg | $3,300 |
Best: diesel |
23 mpg | 22 mpg | $2,850 |
Best: gas |
23 mpg | 23 mpg | $2,700 |
Best: gas |
21 mpg | 21 mpg | $2,950 |
Best: gas |
21 mpg | 21 mpg | $2,950 |
Best: gas |
20 mpg | 20 mpg | $3,100 |
2021 Gladiator recalls and complaints
Questions
Does the 2021 Jeep Gladiator need premium gas?
No. The diesel runs on diesel fuel, the rest use regular.
How does the 2021 Gladiator's MPG compare with the 2020?
For 2021, the best gas version is rated 19 mpg, the same as the year before.
Sources and method
- US EPA and Department of Energy fuel economy data (fueleconomy.gov), file dated Nov 4, 2026.
- EPA fuel price assumptions: regular $4.00, midgrade $4.61, premium $5.01, diesel $6.13 a gallon; electricity $0.15 per kWh.
- Recall and complaint counts: NHTSA recall file dated Nov 12, 2026 and complaint file dated Nov 11, 2026.
Ratings are EPA estimates. Real-world mileage depends on how, where and in what weather you drive. How we build these pages. Spotted an error? Tell us.