Totally get that. Adding miles just for testing sucks, especially if you care about resale. I started using a system from Dynotest that lets you do full dyno runs without touching your mileage. You still get accurate, detailed feedback on your upgrades, and your odometer stays frozen. If that sounds like what you need, you can order here
https://dynotestpro.com/ . It’s super easy to use and keeps your mileage untouched.
