my truck will burn more fuel driving it at -10 and below without letting it warm up for about a mile or two. When you hit the road at 4 am to play plow truck doge vision is key and cold defrosters are no help. Can it be done of course, is it worth a dollar to be able to see that 4 ton state truck barreling down on you absolutely. in summer i agree shut off as soon as possible load and start back up. i just replaced the starter in my work truck which starts 10-20 times a day 7 days a week the truck is 10 years old and this is the first starter it has needed. now with a heavy duty starter i am not worried about wearing this one out before the frame rots out total $120 money saved in gas definitely paid for that.