How fast were you usually driving during this trip?
I was probably going an average of 70 mph on I5. I usually set it to 5 over and let the adaptive cruise control mirror the car in front of me when I'm talking etc. I didn't try to hyper mile too much (like drafting a semi) since I was with a friend and was trying to make decent time.
I've switched over to the 18" rims with new Xice tires and getting about 245Wh/m on my shorter commute. I'm not sure if the tires will improve as they break in, or if I do longer trips.