Agreed.... these little Hondas dont burn oil when new.
Incredible that a Honda dealer would even say something like that. If that were true, Honda Motor Co. would most certainly not enjoy the global reputation that they do for producing the highest quality small engines on the market.
Based on the info posted in this thread by the OP, there are a couple things that would seem to be clear...
1) If any small engine were burning oil at a rate consistent with the details of this case, ie. aprox 1.8 quarts in 1400 miles, it would have been blowing blue smoke out of exhaust at such a rate that no one could miss.
2) The fact that the bike went a full 1400 miles after the dealer performed the oil change, tells me that the failure was not likely caused by a sudden and complete loss of oil.
I suspect that the likely cause of this failure, is that the tech performing the oil change failed to refill the engine with the proper amount of oil. IMO, there is simply no other plausible explanation for this failure.
The take-away for others reading this thread, is it would be wise to not only check the oil level periodically... personally, I check the oil level in my bikes prior to the days ride... but to definitely check it before riding away if you had the oil changed by someone else (Honda dealer, indy shop, you best buddy, etc.).