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2021 Kia K5 GT
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I'm currently using shell 91, haven't noticed any difference in acceleration but I haven't gone over 4k rpm.
Manual says 87 or higher.
 

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I am using Shell 87- they have some of the highest amounts of detergents in their gasoline and I want to keep the engine nice and clean on the inside. Plus, sign up for Shell Fuel Rewards and get 5¢+ off per gallon. If you have a Circle K/Shell station, get an Easy Pay card and it stacks on another 6¢ per gallon off. I have reached the 10¢ off fuel rewards tier and so I am saving 16¢ per gallon at the pump. If you get an Easy Rewards card, you save an additional 30¢ per gallon for the first 30 days that shows up when the card processes through the bank.. so right now for the next 30 days, I am saving 46¢ per gallon
 
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