What Does the B Mean on Prius Gear Shift

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Here’s the fun part. The Prius will automatically try to simulate engine braking on long downhill stretches, even in normal Drive mode. But by shifting into B, you’re telling it, “Go harder!” It maxes out the regenerative braking effect.

Think of B as your mountain mode. If you live near hills, or you’re towing a small trailer (yes, a Prius can tow things!), then B is your best friend. You’ll notice your foot rests more lightly on the brake pedal, and your battery gauge climbs up happily.

Let’s be honest: it also feels a bit like a video game cheat code. You’re coasting down a slope while the dashboard shows you’re regenerating 3.1 miles of electric range. It’s a quiet little victory every time.

What Does The B On Prius Shifter Mean | The Tube

But Don’t Use It All the Time

Here’s the catch—and it’s a fun one. Using B around town, on flat roads, is kind of pointless. In fact, it can be less efficient than just coasting in Drive. Why? Because coasting in Drive uses almost zero friction, while B always adds that slight drag.

So if you drive on flat highways with B engaged, you’re actually slowing yourself down unnecessarily. Your fuel economy might dip because the car is working against the regeneration. It’s like trying to walk with the emergency brake on—just a little confused.