I have not seen anything specific on gasoline for the 2005 Mustangs.
While we lucky 2005 owners are good to go with regular in both the GT and V6, what effect does using premium have or is it just wasting money buying higher octane fuel?
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PERFORMANCE WHITE 05 GT COUPE, PREMIUM, 5-SPEED AUTO, SHAKER 1000, ACTIVE ANTI-THEFT, INT COLOR ACCENT, IUP, FRONT SEAT AIRBAGS
I think it not a waste ... you running a good grade fuel you will get a cleaner burn
and less build up on the eng. plus if you have it tune and the time set wright you can
go a good HP gain. on it...
That how i look at it ..
I run 94 in all my car/trucks .. even at $ 2 69 a GL..
I have not seen anything specific on gasoline for the 2005 Mustangs.
While we lucky 2005 owners are good to go with regular in both the GT and V6, what effect does using premium have or is it just wasting money buying higher octane fuel?
Its just a waste unless you have it tuned to a specific octane. It is tuned from the factory for 87 octane.
The timing would have to be changed to take advantage of the higher octane, with a computer tune, that would do it.
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Run 87 if you're not tuning it. Higher octane will actually leave residue, hence run 'dirtier' because of the slower burn you don't have the timing for.
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KJ, poorer but happier
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Run 87 if you're not tuning it. Higher octane will actually leave residue, hence run 'dirtier' because of the slower burn you don't have the timing for.
Run 87 octane if you are stock anything higher and you are wasteing your
money.Run 91 octane or higher if you have your timming advanced or you
have a power adder like a supercharger or nitrous.Running higher octane
WILL NOT leave any residue that is false.Also the higher octane burns
cleaner and the lower octane burns "dirtier" it's a proven fact.
Run 87 octane if you are stock anything higher and you are wasteing your
money.Run 91 octane or higher if you have your timming advanced or you
have a power adder like a supercharger or nitrous.Running higher octane
WILL NOT leave any residue that is false.Also the higher octane burns
cleaner and the lower octane burns "dirtier" it's a proven fact.
I'm interested in knowing who proved anything about lower octane burning dirtier. The only fact I know about octane levels is the higher the octane the harder it is to burn. This tells me that running higher octane than the car requires is wasteful. Also, harder to burn means the higher octane will not burn as completely as lower octane. That means residue.
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Based on the automotive classes I took in college.... Higer octane is a waste unless car is tuned for it. Burning cleaner or dirtier... I think that we should be referring to rather or not the fuel gets a complete burn. (Much of the rest of "incomplete burn" exits the exhaust.) The Amoco Ultimate commercials state: burns cleaner, more power, etc FOR CARS THAT COULD BEDEFIT FROM HIGHER OCTANE FUELS... It is that type of commercial that leads people to believe that higher octane is better, no matter what... it appears that their marketing worked on some people. Sorry that you are wasting your $. But that's ok its your dough. There is a similiar case with Mobil 1 synthetic oil. Yes its very good, but only about 5th best or so based on lab results. Ahh, isn't marketing great?
I think it not a waste ... you running a good grade fuel you will get a cleaner burn
and less build up on the eng. plus if you have it tune and the time set wright you can
go a good HP gain. on it...
That how i look at it ..
I run 94 in all my car/trucks .. even at $ 2 69 a GL..
The brand of fuel you use plays a larger role than the higher octane fuel as it relates to the quality of fuel. A higher grade, does not equal better fuel... The college auto instructor I had suggested Shell and Mobil are the best fuels, based upon quality. I believe much of that MAY be a matter of opinion. I usually use the average fuel such as Citgo (in my daily driver 4 bangers) but I feel that the lubricant one uses is even more important. (Synthetic versus conventional)
The brand of fuel you use plays a larger role than the higher octane fuel as it relates to the quality of fuel. A higher grade, does not equal better fuel... The college auto instructor I had suggested Shell and Mobil are the best fuels, based upon quality. I believe much of that MAY be a matter of opinion. I usually use the average fuel such as Citgo (in my daily driver 4 bangers) but I feel that the lubricant one uses is even more important. (Synthetic versus conventional)
Mobil and Chevron ARE the best fuels you can use in your Mustang.
Ford highly recommends useing Mobil or Chevron in your 05 Mustang.
"Are you tempted to buy a high octane gasoline for your car because you want to improve its performance? If so, take note: the recommended gasoline for most cars is regular octane. In fact, in most cases, using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage or run cleaner. Your best bet: listen to your owner's manual. The only time you might need to switch to a higher octane level is if your car engine knocks when you use the recommended fuel. This happens to a small percentage of cars.
Unless your engine is knocking, buying higher octane gasoline is a waste of money, too. Premium gas costs 15 to 20 cents per gallon more than regular. That can add up to $100 or more a year in extra costs. Studies indicate that altogether, drivers may be spending hundreds of millions of dollars each year for higher octane gas than they need.
What are octane ratings?
Octane ratings measure a gasoline's ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders. Most gas stations offer three octane grades: regular (usually 87 octane), mid-grade (usually 89 octane) and premium (usually 92 or 93). The ratings must be posted on bright yellow stickers on each gasoline pump.
What's the right octane level for your car?
Check your owner's manual to determine the right octane level for your car. Regular octane is recommended for most cars. However, some cars with high compression engines, like sports cars and certain luxury cars, need mid-grade or premium gasoline to prevent knock.
How can you tell if you're using the right octane level? Listen to your car's engine. If it doesn't knock when you use the recommended octane, you're using the right grade of gasoline.
Will higher octane gasoline clean your engine better?
As a rule, high octane gasoline does not outperform regular octane in preventing engine deposits from forming, in removing them, or in cleaning your car's engine. In fact, the U.S. Environmental Protection Agency requires that all octane grades of all brands of gasoline contain engine cleaning detergent additives to protect against the build-up of harmful levels of engine deposits during the expected life of your car."
Check out the August 2005 issue of 5.0 Mustang & Super Fords. There is an article on the Kenne Bell supercharger and they mention a little about premium fuel. Basically it says the Spanish Oak engine management (computer) is trying to run aggressive, premium-fuel spark tables and uses the knock sensors to keep timing in check to run on 87 octane. I read a different article a few months ago that said one of the cheapest tweaks for power was to run premium fuel. The computers in these cars are learning computers and will adjust themselves accordingly. I don't remember which magazine that was, but i'm sure it's on the internet somewhere.
My Dad is a mechanic, and he said that my car (v6) is built to use regular gas. I could user higher grade gas, but it's not necessary. Regular is just fine for it.
I use only 87 octane fuel for my City fleet of cars and trucks. My police units average 100,000 miles in three years (around 350,000 piston miles). We have not had any issues with pinging or knock under heavy use. As for carbon build up I have torn down 3 engines after throwing a rod and found only a small amount of carbon on the pistons. Tune ups are done a 80,000 miles with little plug wear.
My BMW and HD motorcycles use 91 octane from Shell.
My own cars and SUV run on 87 and I plan on running 91 in the 05 when I take it to the Street Drags in July. This will be done while running a SCT tune for 91 octane.
Save your self a ton of money and buy the 87. :thumbsup
i could be mistaken but from what i understand there is no difference in the quality of fuel between 87 octane and 93 octane. the higher the octane the slower the burn which allows you to advance the timing and make more power. now when i asked my buddy why cars with some age to them start wanting higher octane to keep from pinging and knocking he said it is due to build up and deposits. the higher octane slows the burn keeping the combustion point closer to where it needs to be.
Credits to GivetoAndy for actually posting some facts and citing a reputable source...
When you start adjusting for different octanes, you need to consider compression ratios and ignition timing. The lower octane ignites at a lower compression ratio than a higher octane gasoline. Result? If your car is tuned to 87 octane, the gasoline will ignite at the correct "time" and your "fuel" will burn as it's supposed to. If your car is tuned to 93 octane, using 87 octane will cause the gasoline to ignite prematurely before the engine cycle is ready for it, creating an "explosion" of sorts (the "knocking"). This could be considered burning "unclean" or "dirty". On the otherhand, using a higher octane rating than what your engine is tuned for will result in a stituation in which the gas ignites too late in the cycle, and possibly not all of the gasoline is used efficiently ("dirty" or "inefficient").
Bottom line: Use the octane rating recommended by the manufacturer, unless you are custom tuning the automobile for a different octane. Or, for an older engine, the lowest octane level required to eliminate pinging or knocking.
~M
*Gas itself burns at the same rate. Take a 1/2 cup of 94 octane in a metal coffee can and throw a match in it. Time how long it takes to burn out with a stopwatch. Do the same thing with a 1/2 cup of 87 octane. They'll take the same length of time to burn out.
Gasoline Grade - Regular, Mid, or Premium 
