[Maranatha]

I notice a big difference when i turn on sport mode. More power and more sensitive throttle.

Two questions though:

What exactly is activated in sport mode.

Does it consume more fuel (assuming you would drive it the same way you would with it off)

Thanks!

 

[X3-terrestrial]

It just activates a more aggressive map on the throttle control. Nothing else, the car "feels" faster.
And yes, since the input is more aggressive, the car will use more gas.

 

[Maranatha]

Thanks! That's what i was thinking. I usually keep it on but then i keep thinking about maybe it's not a good idea to waste gas because it's my daily driver.

The previous owner had upgraded the entire exhaust system plus tune. Perhaps why it sounds very different when sport mode is engaged.