The 2013 MINI Coupe S or MINI Cooper John Cooper Works are among several models in this lineup that can be seen as bona fide performance cars; but it's easy to forget that the Cooper family is mostly a family of light, compact, economical four-cylinder hatchbacks.
On that matter, the MINI Cooper models are surprisingly efficient, scoring 29/37 mpg city/highway in base form with the manual transmission. Opt for the automatic and you'll only lose 1 mpg in both city and highway numbers.
The John Cooper Works is the most powerful model in the range, but it still earns 25/33 mpg. Cooper S may be the best compromise from a gas mileage versus performance standpoint, as they get 27/35 mpg with the manual and 26/34 mpg with the automatic.