wow 2000 miles and 52 average, that's pretty good man for a road trip. Did you put your bikes hitched behind the back? If so that's still pretty impressive, cheating areodynamics like that

i got around 20 km a liter when i drove a civic 5 spd using advanced hypermiler techniques
and now I drive a salvage nwh20 prius that gets almost to 25 km/l with 195,000 km to date.