i commute 50miles a day 6 days a week and spend about £70-80
i get in the motorway around 28mpg if i stick to 70 on cruise control but when i get carred away the fuel economy is less.
these are not cheap cars to run as the HAVE TO BE RUN ON SUPER also. not starting a super unleaded debate, search it theres laods of info on here
HOWEVER they are lovely to drive and i find mine well worth the money, even just driving around town and on the motorway its a dream
hope that helps. any ques pm me
rich