I agree with both of the above posts. I actually made a little cheat sheet with the miles and mpg for each 1/4 tank. This way I can see that after 1/4 tank if I've gone X amount of miles which gives me X mpg. Then I can look at the EMPTY section and see approximately how far I should be able to go on that tank if I hold that mpg for the tank. It's a rough estimate because both the Fuel Gauge and MFD are not 100% accurate.