I get about 430 a tank and its usually right on a quarter tank and takes 11 gallons. people who get 600 a tank. where is your gage when you fill up?
Your question appears simple, the answer is complicated. You want to know how people get the highest range? The range you can expect depends on your average MPG and that depends on the following:
1. Your mix of city/highway driving.
2. How you use the accelerator.
3. How broken-in your engine is.
4. What type of transmission you have.
5. What is the outside air temperature.
6. How your tires are inflated.
7. Do you drive with Cruise Control.
8. How much you use the brakes. (The more you brake the more fuel you waste)
9. Do you want to play "chicken" with your fuel gauge to get High Range which is a meaningless number and will take care of itself with high MPG.
Having to refuel a CR diesel that has run completely dry is something you will only want to do once in a life-time. So when the yellow light comes on and says "Fuel Low" you have about 50 miles left at your current consumption rate before you are sucking air. You better stop and get some fuel quick.
Personally, I don't care if I fill up at 400 miles or 630 miles. The number you need to try to achieve is the highest average MPG. That's why we bought a car with this engine.