I just finished a 1000 mile trip. The first leg averaged 17.5 mpg on the evic, but hand calc was 16.5 mpg. I mostly drove the speed limit (65-75) and MDS was active most of the time when speeds were below 70 mph. The return home averaged 15.5 evic and 14.5 mpg hand calc. That leg was with a strong headwind the entire time and higher speeds, so MDS was rarely on.