DecodedCarsAudi A3 vs BMW 3 Series
2026 Audi A3 vs 2026 BMW 3 Series — two rivals compared on efficiency, size, safety and reliability.
The short version
The BMW 3 Series is more fuel-efficient: 31 vs 28 MPG combined in its best version.
That works out to about $300 a year less in fuel for the BMW 3 Series (EPA estimate, 15,000 miles).
The BMW 3 Series is the bigger car, about 8 inches longer.
Across all model years since 2005, the BMW 3 Series has had fewer recall campaigns (4 vs 28).
The two cars
The 2026 Audi A3 is a subcompact car offered with a 2.0L 4-cyl turbo engine and all-wheel drive. It measures about 177 inches long and 72 inches wide on a 104-inch wheelbase, with a curb weight of roughly 2,866 lb.
The 2026 BMW 3 Series is a compact car offered with 2 engines (2.0L 4-cyl turbo and 3.0L 6-cyl turbo), including a hybrid version and rear-wheel drive and all-wheel drive. It measures about 185 inches long and 72 inches wide on a 112-inch wheelbase, with a curb weight of roughly 3,494 lb (3-Series 330i Xdrive 4dr Sedan).
Buying used? The 2024 A3 and the 2024 3 Series have the fewest problems in our data; avoid the 2015 A3.
Basics
Efficiency
Performance & space
Safety & reliability
Interest
Green = clearly better. Prices are not included. How we calculate this →
Which one should you choose?
Choose the Audi A3 if…
- You want something easier to park (8 in shorter)
Choose the BMW 3 Series if…
- You want lower fuel bills (31 vs 28 MPG)
- You want more room (8 in longer)
- You want a hybrid or electric option
- You put reliability history first (4 vs 28 recalls since 2005)
Pros & cons of each
2026 Audi A3
- Excellent fuel economyUp to 28 MPG combined — 17% better than the average 2026 subcompact car (24 MPG).
- Lots of standard safety tech5 of 5 key driver aids standard on the versions we checked.
- Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.
- Modest powerUp to 201 hp, versus about 311 hp for similar 2026 models.
2026 BMW 3 Series
- Hybrid version availableOffered as a hybrid as well as gas.
- AWD / 4WD available
- Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.
Full 2026 Audi A3 specs →Full 2026 BMW 3 Series specs →Compare fuel costs for your driving →Compare size & garage fit →