I daily drive a 2004 DII. I get about 300 miles per 21-22 gallon tank.
A tank costs $68-$80 in a state with some of the cheapest gas prices in the entire United States.
If you really do daily drive your Rover, i.e. to work and back, to the grocery store and back, etc., you're like me and spending somewhere around $200 a month in fuel.
There's nothing romantic or cool about it. Daily driving a Rover V8 is a profoundly inefficient way to get around. Just sayin'.