Manifold Vacuum Experiment

So we took Vixen to town today. No spark knock that we noticed. She was noticeably less cold natured. Not that she was bad to begin with. But from what I can tell, she's running cooler. It was a cool day, but, even so on cool days like this before, she always ran a touch hotter when she got up to temp. Today she ran a tic cooler. Even though the idle is noticeably a tad more rough, it's cleaner too.....if that somehow makes sense. Evidently, when I tried this before, I did something wrong, because I believe she runs a little better with MVA. Definitely not the night and day I got from the truck, but there is improvement.