With BMW's future lineup increasingly leaning toward all-electric architectures—as seen with the upcoming i3—the current generation of the 3 Series and 4 Series may represent the final iteration of their kind. We put the gas-powered M340i, specifically the commemorative 50 Jahre Edition, head-to-head with the high-performance electric i4 M60 to determine how these two distinct approaches to sport-sedan engineering stack up.


Shared DNA and Design Parallels

Despite their different powertrains, both vehicles share the versatile CLAR platform and an identical 112.2-inch wheelbase. In terms of cabin experience, they are nearly indistinguishable from the driver's seat, featuring almost identical dashboard layouts and center consoles. The primary interior variations are subtle, such as higher-mounted door pulls and repositioned armrest controls in the i4.


Performance Dynamics: Combustion vs. Electric

The core disparity lies in their propulsion systems:

  • BMW M340i: Equipped with a turbocharged 3.0-liter inline-six engine, delivering a robust 386 horsepower and 398 lb-ft of torque paired with an eight-speed automatic transmission.
  • BMW i4 M60: A performance powerhouse producing 593 hp and 586 lb-ft of torque, significantly outperforming the M340i in acceleration with a 3.7-second sprint to 62 mph compared to the M340i’s 4.3 seconds.

While the M340i maintains a traditional, rear-biased balance and a classic mechanical feel, the i4 offers a lower center of gravity due to its battery placement, which aids its agility at lower speeds. However, the i4’s extra mass can become more noticeable during high-speed maneuvers.


Daily Usability and Considerations

Choosing between the two depends heavily on your lifestyle requirements. The i4 M60 appeals to those seeking modern efficiency, with a range exceeding 250 miles and rapid charging capabilities that allow for a 10-to-80 percent recharge in roughly 30 minutes. The liftback design also provides added practicality for daily errands.


Conversely, the M340i remains a favorite for driving purists. As noted in the review:

«That inline-six is silky smooth and sonorous, and BMW has worked magic to make it surprisingly efficient for something pushing 400 hp.»
With fuel economy figures around 29 mpg combined, it remains a compelling choice for those with long highway commutes.


The Future of the BMW Sedan

BMW’s roadmap remains somewhat opaque regarding the 4 Series’ longevity. While an M350 is expected to eventually replace the current mid-range gas 3 Series, the future of the 4 Series Gran Coupe remains subject to speculation. Current industry rumors suggest the 4 Series may remain in production for several years following the launch of the new i3, potentially positioning it as the final bastion of traditional BMW design language in the near future.