Fiesta 2007 zetec 1.4 . Fuel Economy

Just wondering has any members encounter heavy fuel usage on this model and year. The Display/ sub menu on 'distance to empty' count down . On a 15 mile trip on dual carriage way trip , you watch the miles to go fall by the second. The next thing I'm doing is putiing more fuel in. Any help much appriciated.
Thanks Globey2b2