If gas prices hit $.80 a litre low grade, I may use it and use octane booster additives (which have not increased in price)
20 litres @ .60 = $12 (price 3 months ago)
20 litres @ .8= $16 (now)

the difference now covers booster at even at 20 L

when regular it gets that high, premium gas is in orbit.

Question: how "good" is that booster vs. pre-mixed?