I believe and correct me if I am wrong,
You run your vehicle as if you were playing your radio.
(all depends on how good your battery in the vehicle is as well)
Start it up every hour or so and let it run for 15 mins or so.
Don't leave your vehcile unattended for longer then 20 minutes.
You may damage your emissions system due to the hot gasses building up
inside the catalytic converter. By revving it up as was mentioned,
you clear the exhaust of that gas buildup.
Ever smell rotten eggs going down the highway?
That is because grandma does not ever put her foot in it to clear out
the system.
edited: some grammar ...