That's about right on par with what I turned out for numbers on my last fill up.
16 US gallons got me 302 miles which is roughly 18.9 MPG.
For the other Canucks on here......60.6 liters to go 487 kilometers gives me about 8.03 kilometers per liter....or 22.5 MPG imperial.
This is on 265/75R16 rubber, 3.55's a ZF, non turbo engine and the pump is turned up LOTS..I rolled coal on more than one occasion to remove the tailgaters but for the most part I took it easy.
what conversion constant # did you set your gauge cluster to, for those tires goofy?