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Old 12-03-2011, 06:45 PM   #1
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anyone using premium gas ?

yes or not worth it


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Old 12-03-2011, 06:49 PM   #2
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I got the focus so i wouldn't have to use premium.
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Old 12-03-2011, 06:51 PM   #3
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Not worth it if you are looking to improve your mpg, but it is worth if you use it from time to time to "clean" the injection system (injectors, valves, combustion chamber, etc).
I say this because I used it twice and the result in mpg was not better than what I had with regular. I will use it from time to time though (for maintenance purpose).
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Old 12-03-2011, 07:11 PM   #4
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I have gone back and forth between grades (3 tanks reg, 3 tanks premium, s tanks reg, etc) and have actually noticed a mileage difference with the premium. Not huge by any means, 1-1.5 L/100km, but still a difference. I think that works out to 2-3 us mpg roughly.
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Old 12-03-2011, 07:06 PM   #5
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I use premium because it says right in the manual "premium fuel will provide improved performance" (pg. 354 (2nd printing)). Plus my station two blocks away from home has ethanol free premium.
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Old 12-03-2011, 07:26 PM   #6
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I use to think that gas was just gas but not any more. Now that i know more about it and how it works it makes sense and now i get it.

I use to get quick trip gas because i thought since it gets more buisness it would have the fresh fuel but after a few data logs ive decided im not going buy from them any more. I tried a tone of different fuels and finally found a fuel my car likes and ive been running it for a few months now.

This is what bad gas looks


And this is what the gas im using now looks like


With bad gas you rknock sensor detects knock and retards your timming. Good gas you can really wind the timming up with no knock and it improves performance.

IMO its worth the extra money. You can do your own testing but ill bet you will come to the same conclusion. You may not really feel it but you can see with the datalogging what it is actually doing.
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Old 12-03-2011, 11:49 PM   #7
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Quote:
Originally Posted by BowerR64 View Post
I use to think that gas was just gas but not any more. Now that i know more about it and how it works it makes sense and now i get it.

I use to get quick trip gas because i thought since it gets more buisness it would have the fresh fuel but after a few data logs ive decided im not going buy from them any more. I tried a tone of different fuels and finally found a fuel my car likes and ive been running it for a few months now.

This is what bad gas looks


And this is what the gas im using now looks like


With bad gas you rknock sensor detects knock and retards your timming. Good gas you can really wind the timming up with no knock and it improves performance.

IMO its worth the extra money. You can do your own testing but ill bet you will come to the same conclusion. You may not really feel it but you can see with the datalogging what it is actually doing.
Not to rag on you but your datalog is inaccurate to say the least.

Gotta do a log from start up to 55mph cruise and take a time stamp from both at the same time stamp.

One log has idle load and another log has driving load. Knock is almost always retarded slightly under normal driving load.

Even though the logs are cool that you posted it would make a difference to have a 55mph time stamp on both logs to see the difference. That way same Load same intake air temps same everything except for the gas.

But I will say this. Good quality 87 will beat a poor quality 91-93 all day.

Now a good 91-93 will also be better then a good quality 87. Is it worth .20 cents more for the small bit of performance your factory tuned car will get..

Simple answer... No

But this is coming from someone that needs premium in 2 of my 3 cars lol.
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Old 12-04-2011, 12:07 AM   #8
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Well i dont care to change peoples opinion really. I feel and with the SCT and the datalogs i can see the results. Anyone can do it themself, i dont really care to run a lower grade fuel to prove what i believe any more.

I know the logs arnt identical but i was pointing out that the engine has a knock sensor and if that sensor detects engine knock it will retard the timming which will lower performance. If lower grade fuel causes knock and retard timming how can it be better to use that fuel?

Even if its a slight improvement in performance IMO every little bit helps with this car.

I paid $200. for a CAI that had little improvement, $400. on a new header and exhaust with little improvement and then $420. for yet again little improvement. After all that i maybe gained 5-10hp so IMO the gain i notice with the premium isnt much compareed to what ive already put into the mods.

If i can feel the difference thats worth it to me.
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Old 12-07-2011, 07:04 PM   #9
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Quote:
Originally Posted by BowerR64 View Post
If lower grade fuel causes knock and retard timing how can it be better to use that fuel?
There is much more to fuel than octane. Different brands use different additives, such as detergents, lubricants, surface protectants, etc. 'Top Tier' brands use much more cleaning agents than required by law, and they will keep the engine running better, longer.

Thus, using a good (e.g., 'Top Tier') 87 octane fuel is better than using a crappy (e.g., oxidized, off-season, no-additives) 93 octane.

You are incorrect in your statement about causing knock. The Focus' engine does not knock when using 87 octane because it adjusts the timing. Of course, it is not getting as much power as it could get with a higher octane fuel, but that is of small importance compared to the cleanliness and life of the engine.
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Old 06-29-2013, 02:03 PM   #10
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Quote:
Originally Posted by BetaDnB View Post
I use premium because it says right in the manual "premium fuel will provide improved performance" (pg. 354 (2nd printing)). Plus my station two blocks away from home has ethanol free premium.
it does?! that's crazy. I'm from the old school where if you put 92/93 in a car that called for 87 it actually made it run like crap. Experimented with my 2003 corolla and never tried again. Maybe I should try some premium and see if I notice a difference besides a lighter wallet. Cali's gas prices are ridiculous!
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