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Old 03-10-2012, 04:53 PM   #81
DAC17
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Quote:
Originally Posted by SpinKix View Post
I just switched to premium and the difference is noticeable.

The low speed stumble/bog is reduced, full throttle acceleration doesn't surge nearly as much, and on the freeway, part throttle response is improved, and the PowerShift doesn't hunt gears as often.

Keep in mind though, here in California our regular is 87, and premium only 91 (AKI), so our premium is more like mid grade elsewhere.


Another point...

I haven't driven enough since switching, but I wouldn't be surprised if my MPG is improved.

Now that gas is $4.27 for regular here, the additional .20 is a smaller percentage of the total, and takes less additional MPG to cover the cost of premium.
Although I generally haven't believed in the "premium gets higher MPG" idea, I must admit that the last two tankfuls of premium have yielded about 5% higher MPG's. I was thinking we might have gone back to summer blend gas, but maybe not.
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Old 04-26-2012, 02:42 PM   #82
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87 vs 89 vs 93 Octane Fuel Economy

Is it OK to run 89 or 93 oct fuel in a 2012 (gen 3) Focus? I have seen some post better MPG with higher octane and wonder if it makes any difference. Will it cause any motor issues?
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Old 04-26-2012, 02:45 PM   #83
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It will not damage the engine. We're still fighting over the mileage 1/2 of the debate.
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Old 04-26-2012, 02:45 PM   #84
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it will work fine, but there are mixed results as to whether it actually helps, i did a lot of testing when I first got the car and found no difference.
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Old 04-26-2012, 02:48 PM   #85
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The mind was pondering it as my MPG is slow to rise. Just now getting an average of over 29mpg with just under 2k miles. 65%/35% hwy city is realistic.
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Old 04-26-2012, 02:56 PM   #86
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Who cares? You MPG nuts drive me crazy. The manual states that the car was designed to run on 87 octane but could perform better on a higher octane. Basically the car may not retard timing as much if you have a slightly higher octane fuel.
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Old 04-26-2012, 02:58 PM   #87
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The mind was pondering it as my MPG is slow to rise. Just now getting an average of over 29mpg with just under 2k miles. 65%/35% hwy city is realistic.
I think ethanol content tends to be the more important factor. More ethanol tends to lower fuel economy a bit. Depending on where you live, you may find that regular 87 octane has 10% ethanol, whereas premium (either 91/93/94) have no ethanol. Since ethanol has about 2/3 the energy that gasoline does, you can expect around a 3% drop in econ from using a 10% blend.

But I know many will disagree and get all angry about how using premium is much better, etc etc. Haven't seen much scientific evidence to back this up, though...

I'd say just use regular, unless you can get premium for almost the same price. And even then, only if there's less ethanol content.
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Old 04-26-2012, 03:05 PM   #88
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Who cares? You MPG nuts drive me crazy. The manual states that the car was designed to run on 87 octane but could perform better on a higher octane. Basically the car may not retard timing as much if you have a slightly higher octane fuel.
Clearly I do as an extra 5+mpg would make a difference to someone that drives 25-30k miles a year. Understand the timing concept, but wasn't sure if there was some other federally mandated tree hugging gadget that might cause an issue with the motor or related components. Thanks for your smart ass reply.
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Old 04-26-2012, 03:12 PM   #89
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I'm currently experimenting with 93 octane fuel now. I haven't noticed any increase in MPG yet. I did notice however my trans shifts better for some reason
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Old 04-26-2012, 03:13 PM   #90
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Quote:
Originally Posted by TBR17 View Post
Clearly I do as an extra 5+mpg would make a difference to someone that drives 25-30k miles a year. Understand the timing concept, but wasn't sure if there was some other federally mandated tree hugging gadget that might cause an issue with the motor or related components. Thanks for your smart ass reply.
I got my car in July and I'm already past 22k miles. I'd recommend looking for ethanol-free gas stations in your area.

My gas mileage went up almost 5mpg when switching from winter blend 87 to ethanol-free 91. I'll try ethanol-free 87 soon, just as a price comparison kind of thing.
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