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Old 05-06-2013, 06:27 PM   #841
timeatkuu
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Originally Posted by Hypnotoad View Post
I get 3% better mileage with 91 octane, which I expect is solely due to premium being ethanol free. Since premium is about 10% more expensive here it is not worth it.
You pretty much have the same results I do... Maybe I won't re-run my experiment with Premium fuel.
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Old 05-06-2013, 07:12 PM   #842
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I use premium gas, but it is close to nothing the mpg gain vs 89. The car is acting better though.
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Old 05-07-2013, 12:38 PM   #843
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Originally Posted by dbsimms63 View Post
Of course your mileage is better using non ethanol fuel. Adding ethanol to fuel is a joke. It causes the fuel to burn less efficiently and therefore your MPG suffers. The only groups that benefit from ethanol being added to fuel are the corn farmers and the oil companies because their profits go up because we have to buy more fuel. The only thing ethanol is good for is making horsepower, and you don't see any 40mpg ethanol dragsters around.
From what I remember, ethanol was used to replace MTBE due to groundwater contamination or something like that. Despite lower fuel economy, E10 apparently lowers emissions on cars. Also, I think E10 is slightly cheaper than E0 per gallon, but I'm not sure whether it evens out or which costs more in the long run.
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Old 05-07-2013, 01:57 PM   #844
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I use premium gas, but it is close to nothing the mpg gain vs 89. The car is acting better though.
I've been sticking with 89 lately as well. Its hard to justify the .45-.50 cent increase over 87 with 93. The car seems to run pretty good on 89. Obviously this could change for me if a tune presents itself in my future.
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Old 05-07-2013, 02:58 PM   #845
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i started on regular (87) and then switched to premium (93). around here premium is usually .35 cents more than regular, and I end up paying about $4-5 more per tank. I'm pretty sure I get at least 30 extra miles out of the tank with my current driving habits. And with premium gas costing about $4.30 , that means I spent $4 more to go at least 30 miles extra, which is about the correct avg mpg (my current avg is 29 - lots of city driving).
When I first put in premium in my car (shell v-power) i felt I had a sportier car, and have not gone back to regular fuel since. I tried other gas brands but I feel that Shell V-power is the best for my car.
I haven't tried midgrade (89) yet.

imo all of these things make premium gas very justifiable if you have an extra $4 per gas tank fillup :)
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Old 05-07-2013, 03:23 PM   #846
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I think there is something to that Shell V-Power, did anyone watch the video a posted a page or so back, Optimax is V-Power. I agree for the driveability improvement alone it is worth it for me. I can get up to a 10% increase in mileage over 87 when I hyper mile. But when I drive in my preferred semi aggressive style the MPG gains are minimal.
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Old 05-11-2013, 09:42 AM   #847
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I gave 93 a test, no gain back to 87
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Old 05-11-2013, 10:04 AM   #848
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Originally Posted by IngotMK3 View Post
I gave 93 a test, no gain back to 87
Doesn't the ECM take a few tanks to relearn?
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Old 05-12-2013, 12:14 AM   #849
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Doesn't the ECM take a few tanks to relearn?
No, it's instant. Otherwise that would be a pretty stupid system.
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Old 05-12-2013, 04:56 AM   #850
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If it was a smart system then it wouldn't take 1,000 miles to adapt. Instead, it is an adaptive system. The 'instant' change will occur after switching back to 87 octane, because retarding timing is instant due to having to protect the engine from pre-detonation incurred with lower octane fuel usage.
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