Diesel Generators

The makers of the Alternate Power Unit claim that the environment is cleaner when you use it while your truck is parked instead of idling your truck for access to heat and air conditioning. the 'apu' is a small, generator-like aparatus that has its own ac/heater and which is much less polluting than the diesel engine. but my questions are 1) since the apu also operates off diesel fuel, doesnt it polllute a little? 2) the apu weighs something so when you drive the truck with that extra weight dont you use more diesel fuel and make more pollution than when you drive without the apu? it seems to me that with the apu we simply move pollution away from the parking lot and place more of it on the highway.
the normal duty cycle for an 18 wheeler is 11 hours driving and 13 hours sitting still per day. of the hours spent sitting still you usually need to be in the truck for 10 hours sleeping.

You would have to calculate the emissions of both for the time in use. They must have some stats on their product. After all they cannot make claims without the threat of lawsuits. That is if they are reputable. Check to see if the have any info on experimental tests they have done and if they are available to the consumer. If not they are probably blowing hot air (no pun intended)

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