Keeping Logs goes with the fact that I had to do it everyday for 38 years as a truck driver. And, it allows me to go back over the records to see the overall performance of my PC.
I will add that at the beginning the mileage was between 8 to 9 mpg. on the first trip from Mass. To Florida. After we had a front end alignment, and engine timing adjusted we were able to improve the mpg . The maiden voyage just after delivery from the factory.