Gas. $6.799/gal. Electricity $0.08/kwh.

Not all freeway rest stops are on federal land. Ones on state/tribal land can have whatever they want.

You might have a parasitic load somewhere in the vehicle.

Check all the fuses with a multimeter when the vehicle is off. If you find one with current across it, that’s your likely culprit.

Credit score plays a huge part in your insurance premium. Have you checked with Tesla insurance?