Premium Gas in a 1.8L Sonic. . . . ?

[JTee2017]

You're not going to get a large enough mileage difference to offset the cost of it, basically no car does.

In post number 1, MPG increase was not the consideration. A bit better performance was since the ECM does not pull timing like it does using 87 octane. This can be seen using a good OBD II scanner.
The difference is noticeable especially at RPMs in the +3,500 to $4,200 range.

 

[Vicarious]

In post number 1, MPG increase was not the consideration. A bit better performance was since the ECM does not pull timing like it does using 87 octane. This can be seen using a good OBD II scanner.
The difference is noticeable especially at RPMs in the +3,500 to $4,200 range.

That's great for post number 1. I was responding to Z71 who wrote: "I never tried 93 octane in this car, but if my mileage increased enough to offset the increased fuel cost and performance increased as well, I would definitely use 93 octane."

Which it wont.

 

[2015sonicls]

I've put 91 or higher in my 1.8l auto since I bought it in December 2014. Its a 2012. I only do city driving, small trips mostly with a bit of highway here and there. I'm getting horrible mileage at 11.4L per 100km. It's a pig on gas. So I can say it's not helping but I still put premium in since it helps me sleep better at night lol.

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I have a 2015 ls manual. If I run regular 87 octane gas, it pings alot and is sluggish. When ever I use 91 or better yet 94 from Chevron it has no detonation at all and has alot more power and especially low to midrange torque going up steep hills and basic driving is hugely improved. Also I average over 40 mpg with premium fuel and around 37-38 with regular. I am by no means gentle on my car. I more often than not accelerate aggressively and am getting almost double the mileage that you are getting..

 

[2015sonicls]

I have a 2015 ls manual. If I run regular 87 octane gas, it pings alot and is sluggish. When ever I use 91 or better yet 94 from Chevron it has no detonation at all and has alot more power and especially low to midrange torque going up steep hills and basic driving is hugely improved. Also I average over 40 mpg with premium fuel and around 37-38 with regular. I am by no means gentle on my car. I more often than not accelerate aggressively and am getting almost double the mileage that you are getting..

Also I am 99 % city type driving.