70 MPG US (3.3 L/100 km) challenge (non-hybrid gasoline and diesel cars)

[Autobahnschleicher]

I wonder:
With more efficient tires, a 1KR-swap and some more aeromods I should be able to do that.
Otherwise, my best tank in my previous car was 1000 km with 35L of E10.
But with the 1ZZ-FED and a super short 5-speed?
No chance.