Curious.
I just put 220km without having to switch to reserve. Put 12.5 liters in the tank. I'm running long TORS with AI removed, all snorkels removed, non drilled airbox, 135 mains, TBS with 1 shim, and 42 pilots. My fuel mileage for city driving has gone down though. The one shim was added to help with the mid range lag.
What about your drive sprocket size - 18 tooth for me.