Installed a timer yesterday in the car to control my block heater and oil pan heater. Now they'll be on for 2 hours before I leave for work and 2 hours before I leave for home. Much less electricity used.
Especially good since I didn't have enough power outlets on board to plug in both block heater and oil pan heater along with all the other goodies (battery charger, battery blanket) before I set this up.