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Here is my method for maximizing warm up mileage.
I keep the car in my garage to eliminate window frost issues. On start up I immediately put it in gear and go. Pulse and coast with engine on, and no heat or any other accessories unless they are absolutely necessary.
I start coasting (engine on) before I have travelled .1 mile, and continue until the engine has reached operating temp in about 2.5 miles. By the 4 mile mark I have passed the EPA highway rating for fuel mileage, which on my car is 31 MPG.
I keep a window cracked and air flow through the car. Usually do not use any heat or defrost, and wear extra clothes to keep warm.
Even in temperatures capable of freezing salt water this usually gets me close to 40 MPG by 7 miles from the cold start, at average speeds of 40 MPH.
regards
Mech
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