BMW 3 Series vs Mercedes-Benz C-Class

By CarWhere Research · Updated 2026-11-05 · Specs from the manufacturers and fueleconomy.gov · Prices paid from CarWhere verified deals

The short answer

Both are five-seat luxury sedans with available AWD, and their base engines match at 255 hp and 295 lb-ft, rated up to 29 mpg combined. The BMW has the bigger trunk (16.9 vs 11.6 cu ft). In CarWhere's verified deals, C-Class buyers paid a median 9.4% off MSRP versus 5.0% for the 3 Series.

Key differences

  • Best combined fuel-economy rating: 31 vs 29 mpg (BMW 3 Series leads).
  • Most powerful version: 386 hp (BMW 3 Series) vs 671 hp (Mercedes-Benz C-Class).

BMW 3 Series vs C-Class specs side by side

BMW 3 Series vs Mercedes-Benz C-Class specifications
BMW 3 SeriesMercedes-Benz C-Class
Model year compared20262026
Base MSRP range (excl. destination)Not published$49,650–$88,000
Powertrains (hp / torque)2.0L TwinPower Turbo I4 (48V mild hybrid): 255 hp / 295 lb-ft · 3.0L TwinPower Turbo I6 (48V mild hybrid): 386 hp / 398 lb-ft2.0L turbo I4 with mild hybrid drive (C 300): 255 hp / 295 lb-ft · AMG 2.0L turbo I4 with hybrid assist and electric exhaust-gas turbocharger (AMG C 43): 416 hp / 369 lb-ft · AMG 2.0L turbo I4 + rear 150-kW electric motor, 6.1-kWh battery (AMG C 63 S E PERFORMANCE): 671 hp / 752 lb-ft
Fuel economy (city/hwy/combined)330i RWD: 28/35/31 mpg · 330i xDrive AWD: 26/34/29 mpg · M340i RWD: 27/33/29 mpg · M340i xDrive AWD: 26/33/29 mpgC 300 RWD: 25/35/29 mpg · C 300 4MATIC AWD: 24/33/27 mpg · AMG C 43 4MATIC AWD: 19/27/22 mpg
Seating55
Cargo behind rear row16.9 cu ft11.6 cu ft
AWD / 4WDAvailableAvailable
Length185.9 inNot published
Width71.9 inNot published
Height56.8 inNot published
Wheelbase112.5 inNot published
Ground clearance5.7 inNot published
  • BMW 3 Series: Seventh-generation (G20) sedan, MY2026 carryover of the 2025 update. MSRP/destination null: bmwusa.com timed out and no BMW press release with 2026 330i/M340i base pricing was found (only the limited M340i xDrive 50 Jahre Edition, $75,200 + $1,175 D&H). Dimensions, ground clearance, trunk and 330i output come from BMW's MY2025 US press release spec table (no 2026 spec sheet found); M340i 386 hp / 398 lb-ft is confirmed by BMW's 2026 50 Jahre release. Height 56.4–57.0 in and ground clearance 5.1–5.7 in by model (330i values used). Width excludes mirrors. An all-new eighth-gen 3 Series (2027 330 / 330 xDrive / M350 xDrive, plus electric i3) launches in the US in Q1 2027. M3 (separate M model) not covered here. BMW does not publish a tow rating for the US 3 Series.
  • Mercedes-Benz C-Class: W206 C-Class sedan, MY2026. MSRPs from mbusa.com: C 300 $49,650, C 300 4MATIC $51,650, AMG C 43 (4MATIC standard) $64,150, AMG C 63 S E PERFORMANCE $88,000. Destination null: mbusa.com model pages show no dollar amount. AMG C 63 S E PERFORMANCE is not on fueleconomy.gov for 2026; mbusa.com lists it at 36/38 MPGe (city/hwy), so it has no mpg row. Exterior dimensions and ground clearance null: mbusa.com shows them only as images and media.mbusa.com has no 2026 spec sheet. The updated C 350 / C 350 4MATIC (MY2027, 187.6 in long, 112.8 in wheelbase, 11.6 cu ft trunk) reaches US dealers in the first half of 2027.

What buyers actually paid

Median discount off MSRP from CarWhere's verified, buyer-submitted deal sheets for new 3 Series and C-Class purchases. Each model is matched exactly, so no other nameplate is mixed in. Use the median as a target discount when you negotiate.

BMW 3 Series

5% off MSRP (median)

Middle half of buyers: 0.7% to 6% off · 0% paid over MSRP

28 verified deals · model years 2025–2026

Mercedes-Benz C-Class

9.4% off MSRP (median)

Middle half of buyers: 5.6% to 10.9% off · 2% paid over MSRP

50 verified deals · model years 2025–2026

Snapshot 2026-11-05. Approved, de-duplicated deals only; shown when each side has at least 5 deals. % off MSRP is before rebates. Methodology

Reliability and known issues

More on each model

FAQ

Which is better, the BMW 3 Series or the Mercedes-Benz C-Class?

Both are five-seat luxury sedans with available AWD, and their base engines match at 255 hp and 295 lb-ft, rated up to 29 mpg combined. The BMW has the bigger trunk (16.9 vs 11.6 cu ft). In CarWhere's verified deals, C-Class buyers paid a median 9.4% off MSRP versus 5.0% for the 3 Series.

Which gets better gas mileage?

Combined ratings: 29–31 mpg for the BMW 3 Series and 22–29 mpg for the Mercedes-Benz C-Class, depending on powertrain and drivetrain. Figures are EPA ratings from fueleconomy.gov, or the manufacturer's estimate where the EPA has not yet listed the new model year (see notes under the table).

How much off MSRP are buyers getting on the BMW 3 Series and Mercedes-Benz C-Class?

In CarWhere's verified deals, the median BMW 3 Series buyer paid 5% below MSRP (28 deals) and the median Mercedes-Benz C-Class buyer paid 9.4% below MSRP (50 deals). Use those as a target discount when you negotiate; results vary by trim, region and month.

Sources

"Not published" means the manufacturer has not released that figure for this model year; CarWhere does not estimate missing specs.

Cite this page: CarWhere Research, "BMW 3 Series vs Mercedes-Benz C-Class," carwhere.com/car-comparisons/bmw-3-series-vs-mercedes-benz-c-class.