LOL I'm coming in last with a bone stock A12 with loads of blow-by, 40s and header/exhaust.... 8km per liter. That's with the A/C on though... with it off I can go down 20 on the idle jets, so that's probably the source of the problem.

Hopefully all that will change with the coming motor change to a 1300cc A12, I don't think the current motor is very efficient.

My 1500 A14 with MSRs, wild cam, worked head, exhaust, high comp. get's 12km/liter in a ute with a 4.1 back when it had a 4 speed.