Was SD tuning my car today for the VE and noticed I had a LOT more knock than usual in my WOT areas(remember high and low octane tables are the same when doin VE tuning, so my car was only commanding 24 timing at WOT).
I said eh, maybe it's the incredibly high heat today.
Put my normal tune back in my car and do some runs later tonight when it was much cooled off. TO my dismay, all of my timing is coming from my low octane table...seems I have bad gas considering I was having major knock earlier in the day and now the car wants to run in low octane table.
Besides bad gas, is there ANY other reason why this would be happening?