2025 BMW 3 Series M340i vs 2025 Audi A4 Premium Plus S line
3 mpg better and 125 more hp vs $11,600 less and AWD. That is the real fork. Key numbers: 386 vs 261 hp, 29 vs 26 MPG.
The 3 Series M340i leads on 3 MPG better, 125 more hp. The A4 Premium Plus S line leads on $11,600 less, AWD. The spec table compares 7 specifications head to head.
Key Differences at a Glance
What's Actually Different
These two vehicles differ in 7 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 | 2025 Audi A4 Premium Plus S line |
|---|---|---|
| Pricing | ||
| MSRP | $60,200 | $48,600 |
| 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 | RWD | AWD |
| Fuel Economy | ||
| City MPG | 27 | 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 | 3,834 lbs | 3,682 lbs |
| Wheelbase | 112.2" | 111.0" |
| Length | 185.9" | 187.5" |
| Width | 71.9" | 72.7" |
| Height | 56.4" | 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 and 2025 Audi A4 Premium Plus S line?
The 2025 Audi A4 Premium Plus S line starts at $48,600, $11,600 less than the 2025 BMW 3 Series M340i at $60,200. On a 60-month loan that is roughly $204/month. All prices are MSRP before destination and dealer fees.
Who should choose the 2025 BMW 3 Series M340i?
The 2025 BMW 3 Series M340i 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 Premium Plus S line?
The 2025 Audi A4 Premium Plus S line is the stronger pick when you want to keep $11,600 in your pocket and the 2025 Audi A4 Premium Plus S line covers your needs; you drive in snow, rain, or unpaved roads where AWD keeps you planted.
Which gets better fuel economy, the 2025 BMW 3 Series M340i or 2025 Audi A4 Premium Plus S line?
The 2025 BMW 3 Series M340i rates 29 combined MPG, 3 MPG ahead.
Which is more powerful, the 2025 BMW 3 Series M340i or 2025 Audi A4 Premium Plus S line?
The 2025 BMW 3 Series M340i produces 386 hp, 125 more than the 2025 Audi A4 Premium Plus S line at 261 hp. The 2025 BMW 3 Series M340i also leads in torque at 398 lb-ft vs 273 lb-ft. The 2025 BMW 3 Series M340i runs a 3.0L I6 mild-hybrid Turbo; the 2025 Audi A4 Premium Plus S line uses a 2.0L I4 mild-hybrid Turbo. Drivetrains differ too: RWD on the 2025 BMW 3 Series M340i, AWD on the 2025 Audi A4 Premium Plus S line.
Is the 2025 BMW 3 Series M340i bigger than the 2025 Audi A4 Premium Plus S line?
The 2025 Audi A4 Premium Plus S line is 1.6″ longer at 187.5″ vs 185.9″. The 2025 BMW 3 Series M340i has a 1.2″ longer wheelbase, which typically means more rear-seat legroom.
Do the 2025 BMW 3 Series M340i and 2025 Audi A4 Premium Plus S line have the same drivetrain?
No. The 2025 Audi A4 Premium Plus S line comes with AWD, while the 2025 BMW 3 Series M340i uses RWD. If you drive in snow, heavy rain, or on unpaved roads, the all-wheel or four-wheel drive option provides better traction. If you mostly drive on dry pavement, the two-wheel drive option saves fuel.
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
How the 3 Series and A4 Stack Up
Two compact cars, two brands, and a decision that comes down to which one fits your commute and budget. The 2025 BMW 3 Series M340i starts at $60,200; the 2025 Audi A4 Premium Plus S line at $48,600. The $-11,600 gap adds up to $204/month on a 60-month loan. That is real money, so the pricier option needs to earn it with capabilities you will actually use.
Powertrain: 3 Series vs A4
The 2025 BMW 3 Series M340i runs a 3.0L I6 mild-hybrid Turbo; the 2025 Audi A4 Premium Plus S line uses a 2.0L I4 mild-hybrid Turbo. The 2025 BMW 3 Series M340i 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 adds 125 more lb-ft of torque (398 vs 273), giving it stronger low-end pull off the line. The 2025 Audi A4 Premium Plus S line comes with AWD; the 2025 BMW 3 Series M340i uses RWD. If you deal with snow, rain, or gravel roads, that traction advantage matters.
What It Actually Costs to Own
The 2025 BMW 3 Series M340i saves roughly $167/year on fuel at $3.50/gallon and 12,000 annual miles. Over five years, that is $835.
Which One Should You Buy?
Choose the 2025 BMW 3 Series M340i when lower running costs matter to you, roughly $167/year less on fuel. Choose the 2025 Audi A4 Premium Plus S line when you want to keep $11,600 in your pocket and the 2025 Audi A4 Premium Plus 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.