Success!
991.4 km and...2.94L/100 km that's 79.9 MPG over 615 miles!!!
Average speed for the tank as per scangauge was 40 mph. Max speed was 81 mph coasting down a mountain.
Here's the car with the wheel covers on.
I used mostly DWL, but climbed the hills at best bsfc and coasted down with the engine on all the time.
I should really get rid of my winter tires...lol