I just drove from New York City to Asheville in North Carolina. At 72mph, the mpg peaked at 37mpg, but 90% of the time, hovered at 36.7mpg. According to my last fuelly fill up, I did 34.3mpg, which included my stops and some hill climbs coming across the Appalachians.
That's a 2.5l with 5,000 miles on the clock. Tyres are at35psi cold.