I've searched on here about warm up and cool down. But most people are talking about cooling to a specific egt. I don't have a tuner so I don't know my egt's. 99% of my driving is just around town and to work sometimes. So how do I know how long to warm up/cool down. If I just let it idle to operating temp. With the exhaust brake it takes about 30 min. (outside temps in the teens). That's not very practical for running errands etc. Any suggestions?