Ford engineers had automotive industry reporters drive the Elantra at a steady 45 miles per hour around its 2.5-mile track in Romeo. Then, reporters hopped in a Focus (one not equipped with the SFE package) and lapped the track at the same speed. Ford says all conditions were equal and that an engineer in the backseat of each vehicle monitored fuel economy.
After dozens of drives, the results showed that the average fuel economy of the Focus was 40.4 mpg versus the Elantra's average of 37.8 mpg. So, Ford seems to have proved that, when it comes to fuel economy, the Focus is more efficient at a steady 45 mph than the Elantra. Do these results matter in real-world driving? We haven't a clue.