I tend to let it warm up for about 5min. then i begin to drive slow and easy till the car is fullyu warm...For some reason in my area we have had some really cold temps which are not normal(its been below freezing at night for a week stright)and so I don;t drive right away. What it comes down to is personaly opinion and logic...True most people who go to work have little or no tim to warm up there cars properly...Id say continue giveing your self 10 min for warm up.
Roz
