Also, remember that it depends on the angle of the car. Most stations try to have flat surfaces to fill, but most have some slope. I have noticed a big difference when the nose of the car is lower than the back by up to a couple gallons, depending on the angle.

2005 Honda Odyssey EX-L RES & NAV - Desert Rock Metallic

2006 Honda Civic Hybrid NAV - Magnetic Pearl

2007 Toyota FJ Cruiser - Black Cherry (First Toyota, Third non-Honda)