said by Jahntassa:That's cool. Five or ten minutes is in the "reasonable" level for me in the coldest of weather, although if I've done it it's only because I forgot I turned the car on. said by Jeffrey:
An old friend of mine used to remotely start his 2002 Ford Explorer from his bedroom 30 mins before he left for work in the winter.
When it's below freezing out, and I had more than a 5-10 minute drive ahead of me, i'd remote start my car and leave the heat on for a good 5-10 minutes (until it was blowing heat AT ALL), and then drive off.
This was for personal convenience.
When I used to do it a lot, I never noticed a difference in fuel usage than when I wasn't.