Good work Nick. However I for one will not be satisfied that this is the definitive JMT pencil without quantitative JMT field metrics - with controls of course. It is one thing to make a theoretical suggestion, but what *experience* do you have writing on the JMT with this pencil, and if you don't, why should we take you seriously?Now I'm not saying that you have to exhaustively quantify all possible pencils on the JMT - such a pursuit would take a lifetime, or possibly be the subject of a PhD thesis or BPL official review article.
I propose that during you next JMT research expedition you determine various parameters of interest, such as rate of shortening, by writing a selected phrase a certain number of times a day on your control paper. I suggest writing "I will never carry unnecessary weight" 100 times per day. You will want to do this each day on the trail in order to get valid results averaged over the whole trail - you wouldn't want to have the results skewed by only writing near lakes where you may wax poetic (in script, if not in text), or only near higher elevations where your energy or blood oxygen may be low.
Since results will vary from pencil to pencil (and indeed from individual to individual) you will need to repeat the experiment using a control pencil such as a Dixon Ticonderoga Wood-Cased #2 Pencil. I would be willing to supply a pack of these as a grant-in-aid.
You should measure the final length of the pencils on Mount Whitney (if you are going north to south). With these measurements in hand you should be able to determine the main quantity relevant to lightweight backpacking, namely inches of text per oz. (ITPO) of the pencils. While bits of information per oz. (BIPO) might be a better measure in some cases, I think ITPO is less judgmental. I don't wish to bias the experiment against people who just want to doodle, or those that just don't have any actual information to convey.
Using the control group you should also be able to measure the relative ITPOs on the two pencils for comparison, as this quantity might be expected to be independent of the individual writing styles, and will allow people to calculate the required pencil lengths depending on the total inches they plan to write during their trip (or trip segment between resupplies). The ratio of the ITPO of your pencil to that of the control pencil will need to be > 1 before I will believe you. However nice the more fluffy properties you describe above, if this is not the case we will have to write this off as just another (possibly corporate sponsored) attempt to bamboozle us into buying something expensive and needlessly heavy we don't need.
Personally I would like to see data from other, non-JMT trips for comparison in order to substantiate your bold claim that the pencils in question are the true best-JMT pencils qua JMT, and not just qua pencils.
I am also aware that a few others, including yourself, may say the other factors such as "low pressure" or "speed" of the writing may, under certain circumstances outweigh the ITPO. While this may be so, the ITPO is critical in order to understand what we are giving up for these vague and qualitative features. Are these non-quantifiable features something we actually NEED, or just WANT?