Comparing MPG with 91 and with 89 octane

[MisFiTkEv]

View attachment 80947 Hey everyone. Since before people even had their turbos there was debate over what the real life MPG was going to be. Just wanted a space for MPG discussion. Ive been putting 91 octane and getting about 25 mpg (when I am not driving like a maniac).
How about you all? what are you getting?

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[Chicago]

View attachment 80947 Hey everyone. Since before people even had their turbos there was debate over what the real life MPG was going to be. Just wanted a space for MPG discussion. Ive been putting 91 octane and getting about 25 mpg (when I am not driving like a maniac).
How about you all? what are you getting?

How do you get the average mpg to show up?

 

[RELBUS]

You have to go into screen setup and tell the display what info you wish to view and where.

 

[Rockreid]

I’m still on my first tank of dealer gas lol. I not going to post numbers until I know for a fact that a couple of tanks of 91 are in it. I’ll be filling it up for the first time this weekend and am wondering exactly what thecdealer put in it because they proudly proclaimed when I was picking it up “you can put regular gas in it!” I just stayed quiet and did an eyeroll to myself.

 

[CatskillsAlex]

View attachment 80947 Hey everyone. Since before people even had their turbos there was debate over what the real life MPG was going to be. Just wanted a space for MPG discussion. Ive been putting 91 octane and getting about 25 mpg (when I am not driving like a maniac).
How about you all? what are you getting?

Great idea, and great MPG!
Thank you.

 

[CatskillsAlex]

I’m still on my first tank of dealer gas lol. I not going to post numbers until I know for a fact that a couple of tanks of 91 are in it. I’ll be filling it up for the first time this weekend and am wondering exactly what thecdealer put in it because they proudly proclaimed when I was picking it up “you can put regular gas in it!” I just stayed quiet and did an eyeroll to myself.

LOL

 

[MisFiTkEv]

How do you get the average mpg to show up?

Just like Relbus said...go to screen setup. Its pretty cool how much you can change the display.

Rockreid... I am curious--- are we all just "afraid" to put in 87 in our turbos? I mean, do we really think it will harm something in the future? Or just make a small "engine knock" that we can ignore? I guess only time will tell!

 

[CatskillsAlex]

Just like Relbus said...go to screen setup. Its pretty cool how much you can change the display.

Rockreid... I am curious--- are we all just "afraid" to put in 87 in our turbos? I mean, do we really think it will harm something in the future? Or just make a small "engine knock" that we can ignore? I guess only time will tell!

My understanding is that it dampens the Turbo benefits. You only get the intended feel (responsiveness, acceleration, etc) and efficiency if you use the premium. @viper88 posted several comments to that effect on another thread - the 2.0L feels more sluggish on regular and only really comes to life with 91.

 

[Chicago]

You have to go into screen setup and tell the display what info you wish to view and where.

Thank u , been driving me nuts how to figure that out , and how to keep track of certain trip distances

 

[Brad1927]

I've been getting 17 in my daily commute, which is short and very hilly city driving. Few highway trips got about 21.5. All on mid grade. No vehicles come close to EPA where I live.

Just switched to 93 (don't have 91 here), so I'm hoping for an uptick.

 

[MrFritz]

22.5 mpg at average 80mph highway speed and driving like vin diesel in town. 93 octane premium

 

[Rockreid]

Just like Relbus said...go to screen setup. Its pretty cool how much you can change the display.

Rockreid... I am curious--- are we all just "afraid" to put in 87 in our turbos? I mean, do we really think it will harm something in the future? Or just make a small "engine knock" that we can ignore? I guess only time will tell!

Forced induction engines (turbos and superchargers) have higher compression ratios when under boost than a “normal” NA engine. Higher compression pressures inside the engine cause cheap gas to detonate or burn too quickly. The ECU has to retard the timing of the engine to avoid damage and this reduces performance and hurts fuel economy.

Higher octane gas burns more slowly to deal with the higher compression. Full performance and fuel economy specs are realized using the recommended 91 octane level the manufacturer requires. Btw, Putting in 93 will not add to the performance even more. 91 is all you need. FYI, my Audi q7 v8 has a NA engine but also needs 91 because it too is a high compression engine, so engines don’t have to be turbos to need Premium fuel.

 

[Chicago]

You have to go into screen setup and tell the display what info you wish to view and where.

I can’t find screen setup lol

 

[Chicago]

Forced induction engines (turbos and superchargers) have higher compression ratios when under boost than a “normal” NA engine. Higher compression pressures inside the engine cause cheap gas to detonate or burn too quickly. The ECU has to retard the timing of the engine to avoid damage and this reduces performance and hurts fuel economy.

Higher octane gas burns more slowly to deal with the higher compression. Full performance and fuel economy specs are realized using the recommended 91 octane level the manufacturer requires. Btw, Putting in 93 will not add to the performance even more. 91 is all you need. FYI, my Audi q7 v8 has a NA engine but also needs 91 because it too is a high compression engine, so engines don’t have to be turbos to need Premium fuel.

My Infinity M35 needed premium as well and it wasn’t a turbo , in Chicago i go to Costco for my Gas and they only offer 93 octane but. It’s still way cheaper then going to a regular gas station here

 

[viper88]

My understanding is that it dampens the Turbo benefits. You only get the intended feel (responsiveness, acceleration, etc) and efficiency if you use the premium. @viper88 posted several comments to that effect on another thread - the 2.0L feels more sluggish on regular and only really comes to life with 91.

I'd run what FCA recommends. The 2.0 is designed to run at it's peak performance with premium. I definitely noticed the difference in performance. You can run the 2.0 with regular gas if premium is not available. Or if the dealers are too cheap to fill with premium during test drives. lol. Modern cars have knock sensors that sense engine ping caused by low octane. Engine computers will make adjustments to prevent potential damage from knock.

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