Matt, that's great, congrats! It's just great a great feeling to brake the record, or to achieve goal. But you have to remember that it'll be a constant struggle. First I was wishing to have an average below 4l/100km (58.8 mpg US), now I'm thinking of breaking 3.5l/100km barier (67.2 mpg US), first for a longer trip, then for a whole tank.
So good luck man! Good job, and thanks for sharing your excitement.