If your worried about fuel consumption don't get a fez

Have you thought about the zs? 90% of the fun for a fraction of the cost.
It is possible to get good mpg by driving very carefully but the st will egg you on.
Most people get between 250-300 out of a tank. The fiesta will be better than the scobby as it weighs less. Doesn't waste as much energy through the awd system.
Even my focus will do 40+mpg but i had to sit behind a lorry to do it
Chris and Scottys top gear test