Evans waterless coolant

I went for a test drive with the float level set higher. Now AFR reads 13-13.5 at WOT (it was 16-17 before). More to the point, the ping is much reduced, only occurring above 70 mph at WOT (was 50 mph). And the car accelerates better at mid-range speed than before (it used to feel weak at 20-30 mph).

Down side, AFR reads around 10-11 at cruise, probably richer than I want.

Bottom line: it's a huge improvement. However, I still want it a bit richer at WOT and leaner at cruise.