What octane gas do you use?

[R2D2]

Is everyone using premium gas or are there people out there using mid grade or regular?

 

[killinghall]

I would use premium as recommended and for better fuel economy.

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[Djltoronto]

I would use premium as recommended and for better fuel economy.

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Are you getting better economy with higher octane? My tests revealed only more power when using higher octane. I get the same economy per volume with 87, 91, or 93.
Definitely more power with 91 vs 87 (stock tune / no tune)

 

[killinghall]

Are you getting better economy with higher octane? My tests revealed only more power when using higher octane. I get the same economy per volume with 87, 91, or 93.
Definitely more power with 91 vs 87 (stock tune / no tune)

I haven't got my car yet but will use premium when I do.

Even if fuel efficiency is going to be the same, I'll still use premium for power.

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[spider55]

I use Premium 91oct

 

[Mozman]

I also use 91 (premium) if I go to a Sunoco, I don't bother going higher.
To help in costs I try to go to Costco or use the BP or Shell apps to save a bit on the per gallon costs.

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[Djltoronto]

I also use 91 (premium) if I go to a Sunoco, I don't bother going higher.
To help in costs I try to go to Costco or use the BP or Shell apps to save a bit on the per gallon costs.

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Anything over 91 - with a stock car/ stock tune - is wasted $.

 

[Gr8ful]

Only She’ll 91.

 

[SpaceGhost]

Given GDI using top tier gas is probably more important than octane. I use Shell 91 in my wife's stinger. 93 for the miata more power

 

[Ragtopfan]

Costco Premium (91) is Top Tier and is the place I gas up whenever possible. Sam's Club (92) is my 2nd choice. Sam's is not Top Tier but they have their own additive package which is fine for the few times I get fuel from them.

Correction: Local Costco is 92 octane

 

[Nightshifter]

I never used 91 Octane in SoCal alone... I always run E20 - E25 and never had any problems for the past 4 years (BMW, Honda, Kia...). E85 mix is the way to go... the car definitely gets better times and no tune necessary. Gives you an equivalent octane of ~93. I don't want to get into the physics of octane, oxygen .. this & that... it just simply works and a lot of peeps been doing this in all sorts of cars. Stock FP should have no problem with this ratio and don't worry about corrosion from ethanol (laugh)... Fed requires all cars after 1994 to be corrosion resistant to both gasoline & ethanol =)

Read this and this is for using straight E85 (you would need a tune and some other mods like the fuel pump system to use straight E85 ~108 Octane) lol... so a low mix ratio... forgetta bout it!

https://eflexfuel.com/us/e85-myths

 

[Nightshifter]

**Update Received and installed the JB4 for 2.5L. ~E20 (no higher) using JB4 MAP 3 on 2022 GT-line. ~5 psi over stock. Runs really well... no codes... smooth. Simple installation, no fuel wires needed (doesn't do anything according to Burgertuning).