for the liter users, i have found a easy to use convertor for the mpg towars l/100km

http://www.pege.org/fuel/convert.htm

tbh 7.5l/100km isnt that bad at all. my 1.4tdci does 5-6l/100km most of the times now (depends on how heavy the foot was)

btw, is there someone that has been driving like a maniac and wrote down that mpg? i am very interested in that number because i will be driving that way for like 4 years