But you don't need to idle the whole time. As much as I hate the new autostop in cars, it's smart enough to turn the engine on just for heat generation. The b

But you don't need to idle the whole time. As much as I hate the new autostop in cars, it's smart enough to turn the engine on just for heat generation. The bigger issue is the growing number of vehicles that turn themselves off after 20 mins in park, engine running or not.