In this video, we cold start a 2016 Subaru Crosstrek and use a thermal camera to watch the engine heat up. It’s -6°C (22°F) outside. We monitor engine RPM (higher at startup), throttle position, ...

On a bitter morning, the urge to crank the heater and let a frozen car idle for ages is strong, but that old habit can quietly chew through fuel, wear out parts, and still leave the windshield frosted ...