Awesome yearly total bro!
Likely about 4000 miles my best year, 3500 logged, and guessing on 500 miles off road being the usual. Now I do about 2000 a year, plus whatever in the dirt. My work commute is about 2 feet now.
My old commute, at least 2 days a week I needed to carry stuff like 1000 pounds of cement, or 500 pounds of paint, so I only did the 30 mile ride about three days a week, then about 50 miles on the weekend for fun.
After wading through your build thread awhile, It looks like you put 8000 miles on a magic pie? If you figure you put about 30 cents per mile savings in your pocket vs putting miles on a car, you have saved $2400 this year. Enough to pay for what you bought to ride I'm sure.
Next year even bigger savings, with what you spend next year on ebikes being the fun budget, vs transportation budget. You'll need more batteries periodically, but the main bikes components should last several more years.
Even though you may spend every penny the ebike saves you on more bike stuff, the really big savings is each year you put off buying a car, and having that payment to pay. Rate you are going, if you still have a car, it will last 10 years longer than normal, or more. Figure if you bike six years, you just saved $20,000- $30,000. At least saving you about 3 thou a year!!