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I believe since you are not baking cookies, there is more to it than just heat out of vents. My guess is that the two other cars you mentioned have a smaller interior cabin volume plus the surface area of heat exchanging materials such as glass is less than the X3. At the vent temperatures you are referring to; it's just a matter of how much time the heater will run to bring the temperature up to your chosen ambient temp such as 70 degrees F. If volume is the same, a 200 F vent output will run a shorter time than say a 150 F. But after that the ambient temperature should be relatively stable.
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