Most mornings with sub-freezing temperatures I start my car and let it run for about 5-10 minutes. I do that so I can get in a somewhat warm car. I drive about 9.5-10 miles each way and for about 5 miles of that, the engine has not reached full operating temp. Most other trips i take are about the same distance, with maybe a few 20 mile trips in there. I don't trust the OLM in Honda's either