Originally Posted by Penguin44
Yup I tend to agree on that. I can see that the rpm are staying higher for longer during my drive in that warm up. But overall its not a huge drop and was expected as it get colder.
How about the first law of thermodynamics? I'm thinking about reduced mileage in cold weather AFTER the car warms up, that would have greater relative effect on longer trips. "Heat and work are forms of energy transfer."
So, colder temperature would mean more energy used to maintain the engine at running temperature, leaving less for the "work" of moving the car once it got there.
Maybe there is a physicist out there who could comment on this?