Magnum cooling

Okay, the terminator software does have 3D timing tables. I’ve only been using the 2D table up until now. I’ll need to have my laptop up so I can see the live table while I’m cruising on the highway.

How do I determine how much is too much for timing at cruise?

When you start getting a tiny surge stop there and take a couple out. Test again. I'm assuming you'll use a flat road to test. As flat as you can get anyway.