...would that take? My truch has been having problems starting, it's a1991 ford f150, and I don't want to risk it needing a jumpstart when I'm far away from home seeing a movie so I'm considering leaving my truck on for around 2 hours. Do you think it would be all right? The gas tank has like 10 gallons or so gas in it or 3/4 way full so idk..your thoughts?