Premium on every other fillup

[Linda z.]

Is this safe for the engine?

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[Craigger]

yes, but why?

 

[The Last Cowboy]

Why not just get mid grade every time?

 

[Linda z.]

yes, but why?

Because where I live Premium is a dollar a gallon more.

 

[jludave]

Is this safe for the engine?

 

[Craigger]

Because where I live Premium is a dollar a gallon more.

Ah - just noticed you have the 2.0l turbo. 87 won't hurt it at all - the knock sensors will retard timing and protect the engine. 91/93 will improve performance and maybe fuel economy a tiny bit.

In the 3.6 you'd just be wasting money.

 

[tomk62]

91/93 will improve performance and maybe fuel economy a tiny bit.

Only if you have "hot weather" and/or have "heavy load conditions".

 

[Craigger]

Only if you have "hot weather" and/or have "heavy load conditions".

Fair point

 

[Reinen]

Premium is not as premium as they make it out to be.
Octane rating is just a measure of fuel stability. How resistant it is to spontaneous combustion and pre-detonation in a hot engine.

It does NOT mean there is more "Go-Go in the juice".

A minimum octane rating only insures the fuel will ignite when it's supposed to. When fuel ignites when it's supposed to, there is zero benefit to paying for greater fuel stability than that.

Your Jeep only needs 87 octane under normal circumstances. Higher octane is just a waste of money. If the engine is doing heavy work (i.e. towing or mountain climbing) in very hot weather (100+F) you might need to bump it up to mid-grade 89. You should rarely if ever need premium 91/93.

Some high altitude states sell 85/86 octane "Regular" gas with the argument that the altitude lets you use lower octane fuel. That is only true for naturally aspirated engines with a carburetor (which hardly anyone owns anymore). It doesn't apply to Fuel Injection vehicles and especially not turbo engines, which negates the thinner high altitude air. Your Jeep should still get at least 87 octane fuel. In high altitude states this may force you to get mid-grade fuel.

 

[Jeffy56]

Is this safe for the engine?

For everyday use, You and the engine would be better served with a high quality, high detergent gasoline like "Top Tier" graded fuel. Ref. p. 506 Jeep manual.

 

[Linda z.]

Why not just get mid grade every time?

Premium is not as premium as they make it out to be.
Octane rating is just a measure of fuel stability. How resistant it is to spontaneous combustion and pre-detonation in a hot engine.

It does NOT mean there is more "Go-Go in the juice".

A minimum octane rating only insures the fuel will ignite when it's supposed to. When fuel ignites when it's supposed to, there is zero benefit to paying for greater fuel stability than that.

Your Jeep only needs 87 octane under normal circumstances. Higher octane is just a waste of money. If the engine is doing heavy work (i.e. towing or mountain climbing) in very hot weather (100+F) you might need to bump it up to mid-grade 89. You should rarely if ever need premium 91/93.

Some high altitude states sell 85/86 octane "Regular" gas with the argument that the altitude lets you use lower octane fuel. That is only true for naturally aspirated engines with a carburetor (which hardly anyone owns anymore). It doesn't apply to Fuel Injection vehicles and especially not turbo engines, which negates the thinner high altitude air. Your Jeep should still get at least 87 octane fuel. In high altitude states this may force you to get mid-grade fuel.

Isn't the Jeep itself a heavy load for that engine?

 

[jludave]

Isn't the Jeep itself a heavy load for that engine?

No.

 

[JEEP4U]

Isn't the Jeep itself a heavy load for that engine?

Could be...... based on your mods.

 

[Rogersocal]

just run 91 all the time and forget about it.

 

[Craigger]

For everyday use, You and the engine would be better served with a high quality, high detergent gasoline like "Top Tier" graded fuel. Ref. p. 506 Jeep manual.

Yes, but for a given brand of fuel, higher octane won't have better detergent properties than lower octane.

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