I'm going to have to say 27 MPG is hard to believe. The best I've gotten HWY is 20.3 mpg. That was a 200 mile stretch with 2 stop lights and two on ramps. Speed limits anywhere from 55-75 and me following them.
i wont call it impossible...but extremely rare. ONCE i got 26mpg. 100% freeway driving all on cruise control and 65mph with no ac running with duckys current 5.3. if he is cruising at 50 to 55 he should get a hair better.
old mod list: H/C/I/N/E/G 408
new mod list: 5.3, gears/posi, mufler and tune : (