I'm not in the habit of promoting products.....but this one actually works great.
Liqui Moly 2007 Jectron Gasoline Fuel Injection Cleaner - 300 ml
I've been using it in all my newer vehicles for several years. I get it from Amazon.
German engineered........our Cooper S loves the stuff. I just dumped in a can in my newly acquired 2004 Xfire. What impressed me the most is the dramatic improvement it made in my 2007 Chevy pickup.
This is just an honest opinion of a fuel injector product that actually works !