@Jkb242 for some real-world numbers, my truck was using 6 qts of oil between changes (5,700-6,000 miles). Once I turned my DOD off via a Lime-Swap tune (member here, $99 tunes), it dropped to 3 qts for the first oil change interval after the tune. It is now about 2 to 3 qts between intervals. I think my engine was pretty bad and I never expected it to get back to zero consumption, but I am happy to see it reduce to what it did.
I think you will not do any damage by disabling it for a time for the test. I had my tune done at 156K and I am at 207K now. Other than the CEL, you won't even notice it. Mine was very quiet when kicking in and out. I had to be near a curb or between city buildings going about 30 mph to hear it engage. It was very subtle, but noticeable once I knew what to listen for. If you can coast a bit when you are between buildings, shift to neutral while still rolling then put it back in drive. You should hear a difference in the sound. Windows down, of course...
In case you aren't catching it, you are simply unplugging the
sensor that is mounted on the brake booster as shown in
@Mooseman 's picture. You
are not disconnecting the vacuum line. DO NOT DO THAT! You will have a very hard brake pedal if you have no vacuum, and possibly no brakes due to the stiff pedal.