As you say,

27Km/L @ 60Kph = 76mpg (63mpg (US)) @ 37mph

Although I know here in the UK, no-one really drives @ 37mph, you are either stuck in town traffic or belting down the motorway somewhere... lol

I'd guess that the 10-mode is the more usefull one to go for as it seems to cover more of a range of driving I believe.

Also we also have to remember that these figures were:

A) released by the factory to make the cars look appealing, and
B) The car was brand new, not 12yrs old...

As for driving conservitively (sp) once you get the feel for throwing the Beat around, I think that might be a bit difficult...lol (I know it is with my Impreza anyway )

Ady.