Fill-up results:
52.4 mpg US = 4.5 L/100 km (calculated). Onboard gauge said 50.1 mpg.
Distance & driving style details:
690.6 km / 429 miles
51% = rural highway (80 km/h ~ 50 mph limit)
9% = freeway (100 km/h ~ 60 mph limit)
40% = sub/urban
Driving style: laid back, but not hard-core hypermiling by any stretch of the imagination:
Highway: cruise control at (or a couple over) the posted limit.
Sub/urban: mild acceleration (<2k RPM); reading traffic well ahead to avoid rushing in to avoidable braking situations; minimal idling.