Speaking of fuel:

The SDL took just under 20 gallons today. However, on the highway, just prior to fuel, it had no power. Didn't miss or slow down, but would not hold an upgrade at 65 mph without a downshift. Acted like it had insufficient fuel.
It would rev to 4K on the downshift without a problem.

In theory, it had another two or three gallons in there. The reserve light was not on yet.

Who knows, maybe it was the placebo effect.