It should be, but here's the rub: If the product delivers the desired results that's great, if it doesn't and you post about it, you'll hear from the A-Rx users that you didn't follow the directions.
Having said that I think 2700 miles is fine for the clean phase. It was the shorter rinse phase that concerned me. Now extending the clean to 4000 miles would be even better, at least I was told that when I used the product.......But things might have changed since then.
I'll check this thread in the morning, have a good trip!!