Anyone here ever have their pistons machined?

Pretty sure 5 gallons of 110 per tank would cure it. The people making our gas these days are f-ing us 6 ways from Sunday Frank. The 91 of today ACTS like the 87 of yesterday in my last engine. I ran my engine for 19 yrs and the 91 octane in 1998 was head and shoulders better than what they call 91 today. I really think an affordable fuel tester would sell like hotcakes if one exists. I would love to call out the people filling the pumps around here with one.