2025 BMW 3 Series M340i xDrive vs 2025 Audi A4 Prestige S line
On paper, the 2025 BMW 3 Series M340i xDrive wins on 3 MPG better, 125 more hp, 125 more lb-ft torque. The 2025 Audi A4 Prestige S line has to win you at the dealer. Key numbers: 386 vs 261 hp, 29 vs 26 MPG.
The 3 Series M340i xDrive leads on 3 MPG better, 125 more hp. The A4 Prestige S line leads on $10,900 less. The spec table compares 6 specifications head to head.
Key Differences at a Glance
What's Actually Different
These two vehicles differ in 6 specifications.
Full Specification Comparison
Specifications and pricing reflect available data as of early 2026 and may not match current manufacturer figures. Always confirm details with an authorized dealer before making a purchase decision.
| Spec | 2025 BMW 3 Series M340i xDrive | 2025 Audi A4 Prestige S line |
|---|---|---|
| Pricing | ||
| MSRP | $62,200 | $51,300 |
| Powertrain | ||
| Engine | 3.0L I6 mild-hybrid Turbo | 2.0L I4 mild-hybrid Turbo |
| Horsepower | 386 hp | 261 hp |
| Torque | 398 lb-ft | 273 lb-ft |
| Transmission | 8-speed shiftable automatic | 7-speed automated manual |
| Drivetrain | AWD | AWD |
| Fuel Economy | ||
| City MPG | 26 | 23 |
| Highway MPG | 33 | 32 |
| Combined MPG | 29 | 26 |
| Fuel Tank | 15.6 gal | 15.3 gal |
| Annual Fuel Cost (EPA) | $2,000/yr | No published data |
| Dimensions | ||
| Curb Weight | 4,008 lbs | 3,682 lbs |
| Wheelbase | 112.2" | 111.0" |
| Length | 185.9" | 187.5" |
| Width | 71.9" | 72.7" |
| Height | 56.7" | 56.2" |
| Safety | ||
| NHTSA Overall | 5/5 stars | 5/5 stars |
| Warranty | ||
| Bumper-to-Bumper | 4yr/50k | 4yr/50k |
| Powertrain | 4yr/50k | 4yr/50k |
| Corrosion | 12yr/unlimited | 12yr/unlimited |
| Roadside Assistance | 4yr/unlimited | 4yr/unlimited |
Frequently Asked Questions
What is the price difference between the 2025 BMW 3 Series M340i xDrive and 2025 Audi A4 Prestige S line?
The 2025 Audi A4 Prestige S line starts at $51,300, $10,900 less than the 2025 BMW 3 Series M340i xDrive at $62,200. On a 60-month loan that is roughly $192/month. All prices are MSRP before destination and dealer fees.
Who should choose the 2025 BMW 3 Series M340i xDrive?
The 2025 BMW 3 Series M340i xDrive is the stronger pick when lower running costs matter to you, roughly $167/year less on fuel; the extra 125 hp matters for your commute or driving style.
Who should choose the 2025 Audi A4 Prestige S line?
The 2025 Audi A4 Prestige S line is the stronger pick when you want to keep $10,900 in your pocket and the 2025 Audi A4 Prestige S line covers your needs.
Which gets better fuel economy, the 2025 BMW 3 Series M340i xDrive or 2025 Audi A4 Prestige S line?
The 2025 BMW 3 Series M340i xDrive rates 29 combined MPG, 3 MPG ahead.
Which is more powerful, the 2025 BMW 3 Series M340i xDrive or 2025 Audi A4 Prestige S line?
The 2025 BMW 3 Series M340i xDrive produces 386 hp, 125 more than the 2025 Audi A4 Prestige S line at 261 hp. The 2025 BMW 3 Series M340i xDrive also leads in torque at 398 lb-ft vs 273 lb-ft. The 2025 BMW 3 Series M340i xDrive runs a 3.0L I6 mild-hybrid Turbo; the 2025 Audi A4 Prestige S line uses a 2.0L I4 mild-hybrid Turbo.
Is the 2025 BMW 3 Series M340i xDrive bigger than the 2025 Audi A4 Prestige S line?
The 2025 Audi A4 Prestige S line is 1.6″ longer at 187.5″ vs 185.9″. The 2025 BMW 3 Series M340i xDrive has a 1.2″ longer wheelbase, which typically means more rear-seat legroom.
How do the warranties compare?
Both offer similar warranty coverage: 4yr/50k bumper-to-bumper and 4yr/50k powertrain.
Explore more: BMW trims, BMW 3 Series trims, Audi trims, Audi A4 trims
The 3 Series–A4 Decision
Shopping compact cars means the 3 Series and A4 will likely end up on the same test-drive day. Here is what the numbers say before you get behind the wheel. The $-10,900 gap adds up to $192/month on a 60-month loan. That is real money, so the pricier option needs to earn it with capabilities you will actually use.
What Powers Each Vehicle
The 2025 BMW 3 Series M340i xDrive runs a 3.0L I6 mild-hybrid Turbo; the 2025 Audi A4 Prestige S line uses a 2.0L I4 mild-hybrid Turbo. The 2025 BMW 3 Series M340i xDrive has 125 more hp (386 vs 261). You will feel the difference merging, passing, and driving with a full car. The 2025 BMW 3 Series M340i xDrive adds 125 more lb-ft of torque (398 vs 273), giving it stronger low-end pull off the line. Both use AWD.
The Ownership Math
The 2025 BMW 3 Series M340i xDrive saves roughly $167/year on fuel at $3.50/gallon and 12,000 annual miles. Over five years, that is $835.
Living With the 3 Series vs the A4
The 2025 BMW 3 Series M340i xDrive weighs 326 lbs more. Heavier vehicles tend to feel more planted at highway speed but use more fuel and are harder to stop quickly.
The Decision
Choose the 2025 BMW 3 Series M340i xDrive when lower running costs matter to you, roughly $167/year less on fuel. Choose the 2025 Audi A4 Prestige S line when you want to keep $10,900 in your pocket and the 2025 Audi A4 Prestige S line covers your needs.
Specifications shown combine licensed third-party automotive data with official manufacturer, EPA, and NHTSA source material. Actual pricing, features, and availability may vary by region and dealer. Always confirm details with an authorized dealer before making a purchase decision. TrimAtlas is not affiliated with BMW or Audi or any dealership.