What Octane gas do you use for your Buick Encore?

MelsRegal

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Regal GS 2017
89 here is now 60 cents more and Premium 80,,,,, so now I'm going to buy 87 and add stp octane booster which costs $3 per fill up instead of $10 buying 93
Read the fine print on the bottle. If it says raises octane up to 5 points that is only .5 or 1/2 an octane number so 87 becomes 87.5.
 

oregon_rider

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Encore
Don't need octane boost unless you're at high altitude. Waste of money.

Have you ever been to Colorado? Denver is at 5280 feet. The mile high city. Regular fuel there is 85 or 86 octane.

You don't need higher octane at higher altitudes.

Actually the reverse is true. A lower octane is usually sufficient

Jeff
 
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mshultz

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2019 Encore Essence AWD
Page 196 of my owner's manual states that the fuel should be a minimum of 87 octane, and no greater than 15% ethanol. There is no exception noted for high altitudes. Boosted engines are able to compensate for the lower air density at high altitudes, so getting away with a lower octane fuel is no longer the case. As previously noted, TOP TIER detergent gasoline is recommended.
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G-324746

You can alway use higher octane, but if your not getting better fuel economy or more power its a waste. Just make sure when you use 87 that you don't get "spark knocks" as that is not good for your engine long term. If it does knock, then you should step uo to a high octane. Also, "super" often includes detergent which help keep your engine clean, so tuning it though your car when you get a good price is not a bad idea.
 
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2019 Encore
Octane booster didn't seem to work. Ran like it was on 87. Back to 93,,, cars getting 35+ mpg in warmer weather... Price of 89 so close to 93 might as well stick with 93

The Lucas booster claims to be better but it $12 a bottle that treats 25 gallons..
 
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