fuel consumption

[R8BWT]

Thinking of buying a mini cooper / cooper s, But I know i'm going to be doing a few miles with work this year anything from 12-16k, so fuel consumption is important.

test drove a cooper S and the sales guy reckoned 35mpg easily possible if I take it easy, but I would like an unbiased opinion, so what do you get? be it cooper or cooper s? and hints on what to look out for etc. The car will be mainly on A and m roads,

want to spend about 10-12k so looking at a 2-3yr old model. Finding the cooper s are better value for money, more options etc.

Cheers