My dailey driver is a 99 Ford Ranger stepside and it says in the owners manual that warming up the engine is not required , i can scan it and print it if needed. If i dont have time to warm it up ( for my own comfort ) i start it and let it run for a minute and drive off slowly . Im with Bob.Here is some more information on this topic. I am trying to find reliable sources, and this one comes from a college source which references its sources as well:
Ten seconds of idling uses more fuel than turning off the engine and restarting it.
If your vehicle is stopped for more than 10 seconds - except in traffic - turn off
What s the best way to warm up a vehicle?
With computer-controlled‚ fuel-injected engines‚ you need no more than 30
seconds of idling on winter days before driving away. Contrary to popular belief‚
the best way to warm up your vehicle is to drive it.
• Warming up the vehicle means more than warming the engine. The tires,
transmission, wheel bearings and other moving parts also need to be warm
for the vehicle to perform well. Most of these parts don't begin to warm up
until you drive the vehicle.
• The catalytic converter - the device that cleans pollutants from the vehicle's
exhaust - doesn't function at its peak until it reaches between 400°C and
800°C. The best way to warm the converter is to drive the vehicle. Driving a
vehicle cuts warm-up times in half. This reduces fuel consumption and
greenhouse gas emissions.
• If your vehicle has a diesel engine‚ idling actually lowers the coolant
temperature faster than shutting off the engine. In other words‚ switching off
the engine keeps the engine warm longer.
Vehicle Wear and Tear
• Excessive idling can be hard on your engine, and damage engine
components, including your vehicle's cylinders, spark plugs and exhaust
• When idling, the engine isn t working at peak operating temperature‚ and fuel
doesn t undergo complete combustion. This leaves fuel residues that can
contaminate engine oil and make spark plugs dirty.
• Restarting a car many times has little impact on engine components such as
the battery and the starter motor. The wear on parts that restarting the engine
causes adds about $10 a year to the cost of driving - money you can recover
several times over in fuel savings
Actually, Northern Nevada gets down to single digit numbers during the winter. I also believe Maryland also has some cold winters as well, which is where the military bulletin I posted above is located. Anyway, the research is scarce on this topic and I think your suggestion to agree to disagree until there is some real research done it the best route to take.