I like your comparo charts-
My 2015 X-Drive 35d with 3,000 miles took a Round Trip from Texas to Kentucky and back over the memorial Day weekend. Total mileage traveled was 2100 miles. 95% of this mileage highways on cruise at 80mph in Comfort Mode, the remaining 5% in Sport mode around town. Slowed by highway construction and holiday wrecks in 4 locations on the return trip. Computer told me I averaged 31mpg going to Kentucky, and 30.9mpg going back to Texas. Beats hell out of my Tahoe's 17mpg at 80mph
Only complaint is the seat coolers are mostly useless in the X-5. The Tahoe pumps A/C air through the seats. Mucho Mejor!