Just wondering what peoples average mileage on a tank of gas is. I get about 300km or 180 miles per
tank of gas is this bad or average ?

Its a 1995 Rage Rover Classic SWB with 65k miles on it, 3.9L

 

Not sure what my overall mileage would be, but I have a '96 4.0 SE and if I cruise @ 75mph I average 15-16mpg. If I back off a bit and cruise around 60mph, it bumps up to 18mpg.

 

You don't say what year your RR is, which engine or how many miles you have on the truck. I took a trip yesterday which just about exhausted the tank - I had three stops and most of it was interstate on which I was doing about 75-80 mph with the AC on for about half the trip on low. My average fuel economy for the trip was 18.5 mpg. I usually get420 _+miles on a 26 gallon tank with mixed driving.