Does BMW Sport Mode change the suspension?

It depends on your vehicle. Don't forget, Sport Mode is all about your vehicle's onboard computer settings. If you've got Dynamic Damping Control (DDC) and/or Active Roll Stabilization (ARS), a lot of your suspension is under the control of your vehicle's electronics. That means switching into Sport or Sport+ Mode is going to give you a stiffer suspension. For other suspension systems, you could well be out of luck.

Does BMW Sport Mode use more gas?

Both Sport Mode and Sport Plus Mode let you rev higher before shifting. That's going to pull more performance out of your engine, but does mean higher gas consumption. On the other end of the spectrum, the Eco Pro driving mode is all about fuel efficiency. You'll get a less exciting ride, but at least you'll have something left in your wallet after your next trip to the pumps.

Does BMW Sport Mode increase horsepower?

Sport Mode is good, but it's not magic. Your engine is going to be as powerful as it always was. That said, Sport Mode does change throttle dynamics, so that horsepower is going to be used differently. Particularly when accelerating, you'll probably feel like you're driving a more powerful car. If you don't tell anybody your secret, we won't tell anybody...

What is dynamic stability control (DSC)?

Dynamic Stability Control (DSC) is BMW's take on traction control. The system makes sure you always have complete control over your vehicle, by pulling in measurements from around your vehicle — the steering angle, brake amount, individual wheel speed and more — and intelligently adjusting your car's behaviour. That means no wheel spin, no sliding and no loss of control going round turns. When you don't need such a helping hand, DSC can be disabled. In Sport+ mode, DSC is switched off completely, giving you far more say in how your BMW handles.