[Piwoslaw]

Thanks for the info Euro
I checked that all of those oils are more expensive than the Total 5w30 I'm using (~27€ for 4 liters vs 20€ for 5 liters). But I'll keep hunting.

While driving today I noticed the following:

• After the coolant temperature settled around 79°C the idle consumption was 0.62-0.65 LPH. Other than the DRLs I also had radio, position lights, and windshield wipers on lowest setting.
• I stopped and killed the engine after ~6-8km (phone call). The engine started quite easily.
• Idle consumption dropped to 0.52-0.56 after 14km.
• After that, starting the engine after killing it takes 4-6 turnovers before it catches
• Turning the position lights off raised idle consumption from 0.55 to 0.62 Turning the position lights on adds 6x5W=30 watts, plus dashboard lighting. At the same time, the on-board computer's backlight dims. It's hard for me to believe that the OBC's dimming backlight saves more than 40-50W. Very weird.

As for the idle consumption being some 0.1 LPH higher for the first umpteen kilometers, this may always be the case, but previously went unnoticed. I know I've seen 0.52 LPH many times, but I can't be sure this was at the beginning of a trip. Maybe the ECU waits after the coolant warms up for the block to soak up some heat before going into lowest fuel consumption?