I decided to see just how economical my new Z4 could be this morning and after a 46 mile (boring) commute up the M6 to work which included 3 miles of country roads on either side of the M6 the mpg reading was 46.3 mpg. Not only that but when I was exiting the M6 after 43 miles it was 49.7 mpg! That's darn good... boring but pretty good!
