I'd like some clarity on the California towing speed limit

Lived in and towed in Calif for 70 years (50 towing) and I just simply run with the trucks. If they slow down, I slow down. Back and forth LA - SF the average speed on I-5 for moho's / trucks towing is 59-61 MPH. Pretty consistant. 59-61 works well for me as that keeps me in top gear.

BTW, I am one of those who can't tell the difference in fuel MPG at 55 or at 65. The difference isn't measurable, at least not on short trips i.e. one or two fill ups. Ca. to Co. I travel 62-65 and get the same as when in Ca.@ 59-61