The fuel efficiency of a Mini Cooper varies by model and year, but generally, it averages around 28 to 36 miles per gallon (mpg). The standard Mini Cooper typically achieves about 28 mpg in the city and 36 mpg on the highway. Performance-oriented models like the Mini Cooper S may have slightly lower fuel efficiency. Always check the specific model's specifications for the most accurate information.
My 04 gets 28.8 MPG all the time. In other words it will go about 345 miles on 13 gallons. Of gas. I use premium grade gas it is the S model with 87 k miles on it.
If it is a CVT transmission then yes you can use cvt gearbox oil in a mini cooper.
The 2003 MINI Cooper runs on premium unleaded (required).
The 2008 MINI Cooper runs on premium unleaded (required).
The 2014 MINI Cooper runs on premium unleaded (required).
The 2012 MINI Cooper runs on premium unleaded (required).
The 2011 MINI Cooper runs on premium unleaded (required).
The 2009 MINI Cooper runs on premium unleaded (required).
The 2004 MINI Cooper runs on premium unleaded (required).
The 2013 MINI Cooper runs on premium unleaded (required).
The 2005 MINI Cooper runs on premium unleaded (required).
The 2007 MINI Cooper runs on premium unleaded (required).