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You have to understand how your particular vehicle works. Instantaneous "start and go" would fail to be optimal for almost any car, and here's why:
1) All modern cars have many sensors and a computer interacting with them. The correct procedure (THIS COSTS NO FUEL) is to pause for about a second after turning the ignition to the on position. Imagine you are a programmer and had to write the software to take in the results from all the sensors and make the corresponding adjustments. Would you be willing to say you could do all of this in less than a second? Half a second? Quarter of a second. No.
2) Bearing in mind that step 1 required no fuel whatsoever, let's look at starting. How does your car start in summer time? Mine starts at a high idle and then drops down almost exactly 20 seconds later, from a cold start. So for my vehicle, in winter, I'm going to give it at least that long and keep my eye on tachometer for any change. I will probably see a change within 30 seconds.
3) A combination of getting the best possible entry condition from step 1, and a sensible brief chance to get a little distribution of fluids and pressures from 2, and we are off. I'm still not taking my vehicle out on the interstate right off if the temperature gauge has not budged yet. But that is a matter of my personal preference.
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