Top New Inline‑Six Engines 2024: Power, Mileage & Price
Bottom line: BMW, Mercedes‑Benz and BMW’s performance arm are rolling out the smoothest, most efficient inline‑sixes you can buy today. They deliver strong torque, better fuel economy and modern tech without the vibration of older designs.
Top New Inline‑Six Engines 2024: Power, Mileage & Price
Image: Top New Inline‑Six Engines 2024: Power, Mileage & Price – Performance Comparison and Specifications
Design & Looks
All three engines share a clean‑line architecture that lets engineers pack more power into a compact block. The BMW B58 uses an aluminum head, twin‑scroll turbo and a hot‑vee layout that keeps the exhaust close to the cylinders for quicker response. Mercedes‑Benz’s M256 adds an integrated starter‑generator, paving the way for mild‑hybrid efficiency while keeping the classic inline‑six silhouette. Finally, the BMW S58 (the high‑performance sibling of the B58) gets forged pistons and a reinforced crankshaft, giving it a sportier look on the valve cover and a louder, more aggressive note.
Performance & Mileage
These engines prove that an inline‑six can be both fast and frugal. The B58 pushes 382 hp and 369 lb‑ft of torque, yet EPA ratings hover around 28 mpg combined in the 2024 X3. The M256, tuned for the EQS 580, delivers 429 hp and a respectable 442 lb‑ft, while the hybrid system helps it reach about 30 mpg equivalent. The S58, found in the 2024 M3/M4, spikes to 503 hp and 479 lb‑ft, but because it’s a performance model, fuel‑economy numbers settle near 22 mpg combined. All three benefit from direct injection, variable valve timing and low‑friction coatings that keep the engine humming smoothly at any speed.
Price & Rivals
Pricing reflects the technology level. A brand‑new BMW X3 with the B58 starts around $45,000. Mercedes‑Benz’s EQS 580, which pairs the M256 with an electric motor, starts near $110,000. The BMW M3 equipped with the S58 carries a price tag of roughly $75,000. Their main rivals are the V6 twins found in many mainstream sedans, which often cost less but lack the natural balance and smoothness of an inline‑six.
| Engine | Mileage (Combined) | Price (Starting US$) | Top Features |
|---|---|---|---|
| BMW B58 | 28 mpg | 45,000 |
|
| Mercedes M256 | 30 mpg e‑equivalent | 110,000 |
|
| BMW S58 | 22 mpg | 75,000 |
|
FAQ
What is the fuel‑economy of the BMW B58?
The B58 typically gets about 28 mpg combined in crossover applications.
Is the Mercedes M256 worth its high price?
If you want a mild‑hybrid that blends power with lower emissions, the M256’s integrated starter‑generator makes the extra cost sensible.
How does the BMW S58 compare to a V8?
It offers similar horsepower to many V8s but weighs less, runs smoother and often delivers better handling due to its shorter length.
What do you think about the return of the inline‑six? Share your thoughts in the comments below!
Source: Read Official News
