I may be late to the party but during the biker DLC I found this dude on YouTube and his videos are perfect. Straight to the point and concise. So far he's only done the introductory video to the new dlc but I await his breakdown video eagerly. (Check out his biker DLC analysis, wish I would have found him sooner)
I just learned this little tip. If you want to transfer cars from an old garage to a new office garage you don't have to drive back and forth. Go to your personal assistant in the office and request vehicle(s) then drive them from the front door to the garage door, and no cooldown timer! repeat 60 times!