Mini has one, only one so far.

I use it all the time on road trips.

I find I get more range out of the car. How much? Probably only $2 worth of gas. But it can be fun sometimes too.

I drive out to the mountains a lot on weekends and there’s a hilly section off the highway for about 15 miles. If I start with moderate speed I can put it in eco and I try to use the coasting mode like a roller coaster. Let gravity do the work on downhills to gain momentum for the uphills.

It’s stupid but it’s a fun silly way to be more economical.