I drove a Tractor Trailer in the Air Force for a long time, at northern tier bases (montana/Dakotas), and in the winter. Yes, diesels are not even close in that diesels will leave sooty deposits on the exhaust when cold (white/grey smoke in the exhaust)... and they need the thin oil to get up into the tiny places they need to go (like the turbo) so yes, diesels need to warm up appropriately... Your honda, on the other hand, needs about 15 seconds.... as everyone else here has said. Dunno about everyone else, but I have a huge incline to get out of my garage, so the fast idle of a cold engine helps me get out. Just gotta be gentle on the throttle for a the 1st few minutes. Every one knows the fastest way to warm up a car and achieve good gas mileage is to drive it easily.