Dont switch between 94 and 91.

They have different energy concentrations.

Get your car tuned for 94.

try a bottle or two of octane booster to see if the knock goes away, if it is lessened then the knock is real. If not, its false.

Also, the ECT has to be >/ 160* F for KR to appear. Not 100% on that, but thats what i've been told.

I dont get it though, redline is scarborough and oshawa.... Will is in whitby now and kevin is in toronto. Ever consider those options?