Direct automotive answer

Why can two identical models have different EPA ratings?

Different engines, transmissions, drivetrains, wheels, body configurations or certification groups can create separate EPA vehicle records. This fuel economy and range answer depends on Engine, Transmission, Drive, Body/wheels. Confirm each against the exact vehicle rather than assuming a class-average figure. The sections below break this down further: what produces the split, how to compare correctly, they are not identical to epa, model-year and mid-cycle changes. 5 related follow-up questions are answered separately below, each with its own conditions attached. This site reviews every answer under a configuration-first standard, verified against FuelEconomy.gov and linked to related fuel economy and range questions for the adjacent decisions this one usually raises. It sits within a fuel economy and range library of 8 related questions, held to the same configuration-first standard.

Because they are not identical at the certification level. Ratings attach to a specific combination of engine, transmission, drivetrain and body, and sometimes wheel and tire package, so two vehicles that look the same can be two separate records.

Mid-year running changes and test-procedure updates can also produce different figures for the same nameplate in the same year.

What produces the split

Any of these can create a separate certification record.

Drivetrain: front-wheel versus all-wheel
Engine or transmission combination
Body style, wheelbase or roof configuration
Wheel and tire package on some models
Powertrain branch: hybrid, plug-in or conventional
Running changes partway through a model year

How to compare correctly

Match on the EPA vehicle ID, not on the model name. That identifier corresponds to one tested configuration.

When the two records genuinely match and the figures still differ, check the model year and whether a test-procedure change occurred between them.

They are not identical to EPA

EPA certifies configurations. Two vehicles sharing a nameplate but differing in engine, transmission, drivetrain, wheel and tire fitment or body style are different configurations and receive separate ratings.

Wheel and tire fitment alone can change a rating, which is why a higher trim with larger wheels can be rated lower than a base trim with the same engine.

Engine, transmission and drivetrain each change the rating
Wheel and tire fitment measurably affects the result
Body style and weight class can differ within one name
Each configuration is tested and certified separately

Model-year and mid-cycle changes

Ratings can also change between model years without any visible difference, because a revised transmission calibration, a new tire specification or an aerodynamic change alters the test result.

Occasionally EPA revises test procedures, which changes published figures for vehicles that did not change mechanically. Compare figures from the same model year and the same source.

Calibration and tire changes alter ratings between years
Aerodynamic revisions can change the figure without visible change
Test procedure revisions affect published figures
Compare within a model year and from one source

What changes the answer

Engine
Transmission
Drive
Body/wheels

Methodology: how to verify an answer on one vehicle →Search EPA configurations →Decode the VIN →Check recall campaigns →

Common follow-up questions

How do I find the exact record for a vehicle?

Use the certification record for that year, make, model, engine, transmission and drivetrain. The EPA vehicle ID identifies one tested configuration.

Do wheels change the rating?

On some models, yes. Larger or more aggressive tires increase rolling resistance and are sometimes certified separately.

Why did the rating change between model years?

Either the configuration changed, or the test procedure or adjustment factors were updated. Compare records within the same model year for a like-for-like view.

Why does the same model have several ratings?

Because EPA certifies configurations, not models. Engine, transmission, drivetrain and even wheel and tire fitment each produce separate ratings.

Can a higher trim be rated lower?

Yes, commonly. Higher trims add weight and usually larger wheels with wider tires, both of which raise consumption.