My mileage per charge improves more than 10% when using cruise control, or a throttle held at a constant speed. Doing this, while contributing moderate pedal pressure, eliminates wasteful current spikes generated bi think he should do a six month study repeating y the PAS system, as pedal pressure varies. Of course this will depend on your controller and how it's wired.
If you want to know for sure, try this: With a fully charged battery, ride a specific course in both directions while maintaining 10mph using PAS 1. Afterward, measure the battery voltage. Fully charge the battery again and ride the same course using cruise control while applying the same pedal effort. Measure battery voltage again and compare. The trick is to try and apply the same pedal effort on both rides. This can be difficult to do, and you'll get the best results by repeating the above experiment several times.