2015 BMW M235i: Thanks for Remembering
by Carlos Lago, Road Test Editor on January 1, 2016
Regardless of where you sit on the gradient of stop-start acceptance, our 2015 BMW M235i does something everyone can appreciate. It remembers if you've turned the feature off.
Stop-start, where the engine automatically turns off when you come to a stop and restarts when you move again, makes appreciable differences in fuel economy, especially in stop-and-go traffic. But it can also come with an annoying delay when it's not calibrated properly and a shudder when the engine starts.
The M235i's stop-start system works quietly and smoothly, but I like this engine so much that I want to feel its power immediately when leaving from a light. I drive with the system off and I'm thankful that the car remembers this setting after I've parked it.
This isn't always the case. The stop-start in our long-term 2015 Volvo S60 has longer delay when restarting the engine. Your foot has to come completely off the brake pedal, whereas the BMW engine restarts once you begin relieving brake pressure.
What's worse is the S60 doesn't remember to keep stop-start off after you've parked it for the night. So every time I start the S60, I'm reminded of the superiority of the M235i's system.
Carlos Lago, Road Test Editor