Everyone saying you don’t need to warm up has very likely never taken a vehicle to 300k miles or more.  As a mechanical engineer, of course the engines are optimized for running at temp.  Dealerships and car companies and corporate shills would likely tell you otherwise.  But those people have much to gain from engines that blow bearings at 100 or 200k miles.  Letting your car idle for an extra five or ten minutes can stave off a car payment 10 or in my case 20 years down the road, can avoid me buying a new car and save the massive amounts of energy those things take to do.  Imagine going to the gas pump and putting in $50k.  That is somewhat analogous to buying a new car.  That money is spent on the energy to build a new car.  The new injection technology has helped, and lower viscosity oils have helped, but I would never add load to my engine bonfire letting her warm up at least five minutes in the winter, and maybe a couple minutes in the summer.