Regular Unleaded Gas (stock) vs Premium Unleaded Gas (tuned) - Focus Fanatics
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Old 02-25-2012, 04:37 AM   #1
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Question Regular Unleaded Gas (stock) vs Premium Unleaded Gas (tuned)

I was just curious how a car performs differently once tuned to run on premium grade gas? Here in California, our grade goes from 87, to 89, to 91. 91 being the premium. I drive a 2.0 Duratec ATX. So, is switching what type of gas your car takes part of a tune if you want it to be? Does it net you any gains over regular unleaded? What's the difference in performance and power and is it worth it to tune your car to these specifications? Or could you see similar gains with a tune just keeping it on regular unleaded?


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Old 02-25-2012, 08:50 AM   #2
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You will see slight gains using 89 but your over all better driveability will still be there ,you could get a 89 and a 91 tune and have both for when you want to play harder

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Old 02-25-2012, 03:03 PM   #3
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Ok, sounds good. So then it basically works like this: 87 < 89 < 91? So obviously 91 would be the best gas to use for playing hardball? Good to know.

Personally, I only make it out maybe once a week every weekend. So I'd probably do the race tune once a week (keeping only 1/4 or less of premium gas in it so it runs out by the time I want to put 87 in) and then for the rest of the week I'd probably go back to the 87 tune to save money on gas. I don't know how realistic that would be, but I'd be open to try it. I don't know, it may be a hassle, but I don't care. I want every advantage for speed and power on race day, but for every other day of the week, I want to the advantage of the cheapest gas.



FYI, I'm right on the cusp of committing to fully modding my car. So it shouldn't be too much longer. Most likely after smog is finished (next week). Then I'll order the tune and everything else. Those damn ricers wont know what hit them!
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Old 02-25-2012, 03:17 PM   #4
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Yes you can do a 87 and still get the driveability and then have a 91 tune for playing

I charge 399.00 and 20.00 for shipping and you get a full Custom Tune and FREE tune updates as you add more mods which no one else does so you wouldnt be charged extra for both the 87 and 91 tune and they both would be a custom tune not a generic tune like most others sell and I dont charge to look over your datalog

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Old 02-25-2012, 09:38 PM   #5
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I'll be coming to you here before too long. I'm almost ready.



But can you explain to me what exactly the difference is (and what you get) between an 87 tune and a 91 tune? I'm sure a lot of other things factor into it, but specifically tuning the car to run on 91 vs 87, what exactly is the difference?
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Old 02-26-2012, 10:15 AM   #6
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The biggest thing is the timing , lower octane fuel cannot run as much timing as a higher octane fuel can
Lower octane fuels burn faster , higher octane fuel burns slower

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Old 02-28-2012, 05:53 PM   #7
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I use premium fuel all the time. Granted there is no aftermarket tune, but it insures full timing. For the .20- .30 more per gallon($3.45 per tank more at 11.5 gallons average fill), its not worth getting cheap.
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Old 02-29-2012, 12:35 AM   #8
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Yeah, but gas where I'm at is up to like $4.60+ for premium. Regular is still around $4.13. We'll see how these prices hold out and depending on that, I'll make up my mind about the 91 tune. Otherwise, I'll just get high performance tune while still maintaining 87 grade gas.
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Old 03-03-2012, 09:40 PM   #9
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i gata get a tune asap...
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Old 03-04-2012, 02:04 PM   #10
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Get the 91-92 octane tune, & enjoy the response & mpg vs 87.
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