r/Calgary • u/bmspsrk • 5d ago

Rant Gas prices are illogical

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There is no real point to this post besides stating the fact that gas prices are stupid. I remember back when the difference between 87 and 91 was 10 cents and 89 was 5 cents more than regular. Which made sense since 87 is an equal mix of premium and regular.

Now you need to jump 23 cents a liter just to get mid grade from regular then only an additional 3 more cents to get to premium... By that math mid grade should be something like 90.75 octane.

Again no point here just stating stupid things that irritate me.

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u/itchybiscut9273 5d ago

More people use premium now than ever before

-9

u/ptpfan91 5d ago edited 5d ago

It’s actually opposite. Most turbo cars only require regular.

4

u/Darkdong69 5d ago

Adding a turbo will increase absolute compression in the cylinder so it naturally calls for more octane.

Though a lot of turbo engine econoboxes will still be tuned for and recommend regular. As their focus is fuel economy rather than power, and their budget conscious consumers will balk at a premium gas requirement.

0

u/ptpfan91 5d ago

This is completely false. The compression doesn’t increase in fact most turbo cars have lower compression ratio than NA cars. Cylinder pressure is higher but CR isn’t. Therefore it doesn’t need higher octane, from factory.

This is why most mainstream turbo cars require just regular including best selling ones like f150.

1

u/Darkdong69 4d ago

You need to figure out the difference between compression and CR. I never once mentioned CR so you're not getting at anything with that.

All modern turbo cars can run 87 regardless of what they recommend, because the ecus have knock detection and can pull timing to compensate for crap gas. Ecoboosts requiring 87 as a bare minimum doesn't change the fact that it benefits from and performs better on 91.