If you take highways that trucks use you'll have no trouble finding stations that sell Diesel fuel. If your car is up to snuff, you hsould be able to go at least 400 miles on a single tank. None of the metro areas you mentioned is more than 400 miles from the nearest metro area.

I'd say Diesel is available every 30-40 miles along I5 from Sacramento to San Diego.

Maybe AAA or U-Haul has a listing of Diesel stations in the state.

In the south bay, it seems all Rotten Robbie's sell Diesel. I'd say more than half the Shells do as well. It's never been a problem for me.

You'd have a harder time finding an outlet to charge your EV.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD