Osmossis

does Premium fuel really make a difference? if so it there a way to tell how much as far as hp or mpg? secondly do the octane boosters actually work?

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thefonz

From what I have read, from what I feel a knowledgable people...... no difference. If is designed to run on 87 or 89 or whatever, that is what you should use.

Megafast13

I always use the Premium. It is just higher quality and better on the engine over time IMO.

I also frequently use Octane Boosters, Fuel Injector Cleaners, Lubes, Slick 50, etc.

They make a dramatic temporary difference with my cars.

With the economy the way it is, it is okay to get the 87...

mojo46

By itself premium does not increase power. However its use becomes mandatory if you've increased combustion pressure significantly through head/piston swaps or supercharging, high spark advance. The premium 'allows' these kinds of mods by increasing the combustion knock threshold. Otherwise you may just detonate your motor into oblivion.

But if your stock motor is detonating or deiseling due to a mechanical/tuning problem, a switch to premium may help some til you get it fixed. So in that situation, switching to premium MAY FEEL like more power compared to regular, in reality the motor is is just not running as crappy. But you should still correct the reason for the detonation.

TM875

From what other CV owners have told me, premium fuel on a Panther just ends up giving the car worse gas mileage. They're rated for 87 octane (except for the 4.6L dohc modulars, like the Mark VIII) - just use what Ford recommends.

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2004 CVPI, Spruce Green