I just bought a 2010 Infinity G37 sedan, and it didn’t even come to my mind that it would need premium gas lol. But I filled the tank to the brim with 87. The engine light came on I’m assuming due to this and the car does run bad it feels. My question is should I use up all the gas then switch, or should I fill it when it’s halfway or something with premium to even it out for now?
You probably flooded the evap system
My question is should I use up all the gas then switch, or should I fill it when it’s halfway or something with premium to even it out for now?
Just use the 87 octane tank of gas just as you would any other tank of gas. Your gas mileage will decrease as will the engine's horsepower but that's about it. Cars which "recommend" 91 octane will run fine on 87 octane. (A friend has 220K miles of proof on his Lexus) I'll link a download for your owners manual, check out page 433
When the gas pump clicks you're done. Anything past that.. you're overfilling your gas tank.
Since your engine light turned on presumably you scanned for codes, what did you find?
Filling it to the brim can cause damage to the emission system, and cause the check engine light to come on. Using 87 octane shouldn't cause the car to run poorly as the ECU should automatically compensate for the lower octane gas and you'll just lose a little horsepower.
