I have a 2006 mini with the cvt and 120,000 miles. Recently I had to replace the cold air intake tube, and afterwards I noticed a significant decrease in my mileage, especially around town. I was getting about 27 MPG city, and up to 30 something highway. Now I'm getting about 17 city and 25 highway if I'm lucky!!!
Any ideas????
I brought it to a mechanic, and he can't find anything wrong with it. It must be a mini thing...

Help!!!!!