When last we walked through this at alt.autos.saab - I'm pretty sure we were reliably informed that they simply order by litre almost exclusively .. :) ..
I'm of two minds on the metric system having grown up on the imperial measures act - only to have to changed about the time I was getting through high school here in Canada. Made for some interesting finals for many.
Interestingly - I can adjust my 1993 Aero display to report metric temperatures and 24 hour clocks - but at the same time still measure mileage in imperial or US gallons. I much prefer metric for measurement and fasteners, but still like imperial for comparative calculations.