There is basically no difference in gasoline "quality" today, it's not been a thing since the 90's. As long as you're using the correct octane, your car will be fine.
Disagree. Quality gasoline has additives to help your engine from buildup on internal parts. Top tier gasolines meet a certain criteria to be labeled as such.
I thought I saw GetGo on the Top Tier website a while back, I'm reasonably sure. They're not on the list right now. But the GetGo website (copyright 2021 lol) says they are. I don't shop there because their prices are always well above adjacent stations, and Costco carries Top Tier so much cheaper that the membership paid for itself for me in gasoline alone in 4 months. Maybe others who frequent other GetGo pumps know the verdict.
That is a huge variation and seems highly unlikely to be caused by type of gas. The more likely explanation is different driving mix between city and highway
dmil103 t1_j2fh5sl wrote
There is basically no difference in gasoline "quality" today, it's not been a thing since the 90's. As long as you're using the correct octane, your car will be fine.