Which gas to use?

[e30og]

Where does it say you lose 10% of your horse power if you use 87 octane gas? I have read the manual and the only thing it says is 87 octane recommended. Why would they recommend it if the care would perform significantly worse? Also the only other thing its says related to using a premium fuel is : "To provide improved performance, we recommend premium fuel for severe duty usage, such as trailer tow."

It is not going to perform significantly worse, trust me there is plenty of power on tap for anything if they tied a boat anchor to the back. The 10% has been relayed in various media outlets, its common knowledge at this point (not speculation). As for using 93, power output (310/320) in specifications is from running 93.

On the other hand, EPA ratings were accomplished with all engines on 87

Run 93 in any turbo car. Turbos heat up the intake process, increasing temps in the cylinders. The higher octane is better knock prevention. Its not really better performance, more so lower octane providing worse performance due to knock. If that makes sense.

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This is true^^ the computer will prevent any kind of knocking by just cutting max output. You can put 87 without any worry of long term wear or knocking. Technically there is no real knock prevention since it wont happen anyways

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[Ecobeast]

Chevron in Canada, 94 octane no Ethanol. Chevron is the only gas I buy.

 

[ELPYBOOST]

Chevron in Canada, 94 octane no Ethanol. Chevron is the only gas I buy.

Lucky you Chevron is only on the west coast. That's awesome 94 with no ethanol.

 

[Mazda]

Run 93 in any turbo car. Turbos heat up the intake process, increasing temps in the cylinders. The higher octane is better knock prevention. Its not really better performance, more so lower octane providing worse performance due to knock. If that makes sense.

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I guess all of california is screwed then

 

[Tommy V]

E85 are usually flex fuel cars and if the police cars were not flex fuel built cars it would have destroyed the fuel system.E85 uses different injectors.Flex fuel u can run any fuel in, but if its not flex fuel and ur running e85 ur going to have some problems.Anyways the amount of ethanol in the fuel now u can run in the mustang, they recommend not to let it sit for over 30 days without running it.I would use the highest octane u can get to prevent pre ignition.

 

[ThatsMrGimp2U]

I guess all of california is screwed then

Because of taxes or how mod friendly they are?

You know what I meant. Same applies for 91.

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[tsunami]

Ethanol...

"Made me think that ethanol is just bad stuff in a gas combustion engine.
I think even worse, the smaller the displacement like weed eaters, lawn mowers, boat motors etc."
Don't put E85 into ANY engine that isn't made for it!
After years of using E10 (oxygenated) gas in my non-automotive engines, I was complaining to my mechanic about all of the repairs and adjustments (I had just paid $600 for carburetor repairs on a couple of ATVs). He said to only use non-oxygenated (non-ethanol) on all of my engines (ATVs, outboard motors, lawn mowers, etc.).
Since then, I have not needed any repairs, even the spark plugs are lasting longer. E85 will also dissolve the fuel lines, etc. if they are not specifically made to handle it.

 

[ThatsMrGimp2U]

I will be running e85. Probably a mild blend of 70/30 (93/e85). More powers yo.

 

[rdycoss1]

I would not run anything but the highest octane I could get. You lose over 10% power by running 87 over 93. Plus, I would never go easy on octane in a forced induction platform, even with modern PCMs and knock sensors.

Mike

I recall reading a Ford statement about 1% loss of power for the GT with 87 vs. 91.... :ford:

 

[Spartan]

I recall reading a Ford statement about 1% loss of power for the GT with 87 vs. 91.... :ford:

Yep NA engines don't get as affected like Turbo's do with the octane.

I think I can handle 430 hp vs 435 hp.

I definitely don't like the hit to the HP from the 87 vs 93 in the EB. The EB needs all the power it can get pulling that weight of the Mustang. Dropping down to around 270 from 310 is A LOT.

When you factor in running 87 in both, sure the EB definitely saves at the pump in $$$. But at that point, you're basically driving a heavier Sonata/Optima.

When you factor in running 93 vs 87, the difference is not that great in terms of MPG saved. The GT gets like an additional 3 gallons with the money saved by using 87 which then gets you around an additional 60-75 miles for the same cost...bringing the two cars within like 30 miles of the same money spent.

 

[ELPYBOOST]

Yep NA engines don't get as affected like Turbo's do with the octane.

I think I can handle 430 hp vs 435 hp.

I definitely don't like the hit to the HP from the 87 vs 93 in the EB. The EB needs all the power it can get pulling that weight of the Mustang. Dropping down to around 270 from 310 is A LOT.

When you factor in running 87 in both, sure the EB definitely saves at the pump in $$$. But at that point, you're basically driving a heavier Sonata/Optima.

When you factor in running 93 vs 87, the difference is not that great in terms of MPG saved. The GT gets like an additional 3 gallons with the money saved by using 87 which then gets you around an additional 60-75 miles for the same cost...bringing the two cars within like 30 miles of the same money spent.

So your saying that 87 is not really worth it putting in EB. Ok I get that but the question is, in the long run would you gain more mpg in 91 with no ethanol or 93/94 with up to 10% ethanol? Any mechanical advantages or disadvantages when putting one or the other?

 

[Trackaholic]

So your saying that 87 is not really worth it putting in EB. Ok I get that but the question is, in the long run would you gain more mpg in 91 with no ethanol or 93/94 with up to 10% ethanol? Any mechanical advantages or disadvantages when putting one or the other?

Better MPG = 91 with no ethanol
Gasoline has more energy than ethanol, so you'll get slightly better mileage with pure gas.

You might get more power with the 93/94 octane ethanol blend, but not sure on that.

10% ethanol shouldn't affect the fuel system. All cars in CA have been dealing with it ever since we got rid of MTBE. My 2003 350Z has 180,000 miles on 10% ethanol 91 octane with no issues.

I'd probably go for whichever was cheaper.

-T

 

[wproctor411]

vp-100 is CARB compliant fuel. Use it on race day or blend some in for nights you plan on running hard, other than that get a tune for 91 octane or whatever fuel you can get. http://www.vpracingfuels.com/vp-100-fuel

 

[Tamadrummer88]

Down here our highest octane is 92, however there is a station near my home that sells 89 octane ethanol free. Would that be better than running 92? All of our gas is E10.

 

[wproctor411]

Down here our highest octane is 92, however there is a station near my home that sells 89 octane ethanol free. Would that be better than running 92? All of our gas is E10.

I think the car adjusts to whatever fuel your running. I would run the cleanest fuel for daily driving. Tier 1 fuels are a good place to start:

http://www.toptiergas.com/retailers.html

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