Easily getting over 550 klm out of a tank. Quite often 600 to 650klms.
Best I acheived was an indicated 8.6 l/100klm out of a tank of almost all country driving with the occasional squirt to overtake etc.
Worst I got was 15.8 l/100klms out of a tank with mostly spirited driving on twisty, and high speed country roads.
Cheap fun