Thanks for sharing all that hard work!
Before retirement, I used to maintain dozens of spreadsheets for work. Thanks for sharing the outcome of all those tedious key strokes!
I have a 15 Solera and tow an 09 Smart Car. Our similarly loaded Solera weighs in at 11,000 lbs. The Smart adds 1,950 lbs, might be about 1,000 less than your CRV toad. After 12,000 miles mostly along I-5 we get a consistent 14.5 mpg towing the Smart at 55 to 60 mph.
Sometimes, conditions are perfect for an experiment. After a fill up in Corning, CA we got about 100 feet behind a semi traveling south at 58 mph. The first bar on the fuel gauge dropped at around 52 miles ... usually drops at around 42 miles. We drafted the truck for about 80 miles before it pulled off at an exit. We filled up again after 200 miles, 80 of which were drafting. We got 15.7 mpg. During our 2,800 mile trip, we had two more opportunities to draft semis at a reasonable and relaxed speed. Both times our mpg number was 1 or more mpg higher than we typically achieve.
You can tell an adequate drafting distance when you feel a slight "buffet" of air, like a slight wind gust, then back off about the length of your RV. You do need to pay attention to maintain the distance and to be able to brake in time if you need to. The attached photo shows approximate drafting distance - each stripe is 10 feet long and each gap is 30 feet
Drafting isn't for everybody and 1 mpg doesn't appear to be a big deal. However, with 30 gallons of diesel, its like getting an extra 30 miles or about 2 gallons of free fuel. One day I'd like to get a shot at drafting for a long distance, perhaps in a caravan of Sprinter RVs?