I've done the drive . . . 3061 miles in 3.5 days towing.
Averaged 14.3 mpg over the entire trip. Grapevine was the only scary part. Pasadena is closer . . . than sacramento only 2500 miles. I don't think you could pay me enough to do that trip again.
It's not so bad once your mind goes numb. Books on tape is the way to go.