hi. i used to have a r54 mini one, and used to get 35-38mpg using shell v power. i bought a r55 cooper, and stayed with v power, i,m now getting 35mpg, and thats with giving it the beans every so often. i have the 5 spoke alloys and the jcw body kit. i think you will find that if you scroll to the predicted milage option, you will see it change as you drive, and may even show more miles of juice as you,re doing that. that,s because it changes depending on how you,re driving at the time. i find i get 300 miles to 3/4 of a tanks, as i never let it go below that, so you,re talking 100mile per 1/4, and dont forget that we are still in the cold part of the year, should get more mpg as it warms up.