Ok i just got into it with the stepdad. Here it is im at my family's house in a New England state and i go outside to start the car from being off and cold all day, its snowing out and ~25 degrees. I start up the 2003 GMC Envoy XL. I put the defrosters (rear electronic, set to front minus the vent for the feet) on almost right away, and rev the engine within the first 5 minutes a few times to ~3000RPM for maybe 10 seconds. Then i put it in drive, foot on the brake (under load for about 30 seconds, to help.) Within the 5 minutes the snow is melting and it is warmed up, whereas previous was sitting as an ice box on the snowy street. Now, of course it is not my SUV so they come outside and say "you dont need to rev it up, it will warm up in the same amount of time." Now. I am thinking that, since i put the defrosters on right away, that it WONT warm up as fast. He is talking about a pre-set idle speed, and that "it would warm up the same." Who is right here? Did i help it warm up? I can say that, from my experience with this SUV, i appear to have helped the warmup happen in half the time (blowing hot air from vents and melting the snow on the windows) with my "revving it up." The videos are uploading now, of the 3000 RPM rev and the oil pressure going to just under 60 before falling back to 40psi. Who is right here?