Who is still using premium gas.
Now quit bitching and go buy some 93
The 05/06 6MT G coupes and sedans (revup motor) need premium because the engines can rev about 600rpms higher and have a powerband higher in the rev range. Higher rpm power typically means more heat in the upper rpms. Nissan recommends premium all the time for these motors.
For all other 1st gen G35s, you can safely run regular and mid grade with no damage to the motor. MPGs and power may or may not suffer. It really depends on how you drive. Drive like a grandma in cold weather and you may see better mpgs. Drive like lunatic in warmer weather and the mpgs will suffer as well as power.
Octane is simply a measure of a fuel's resistance to burn. The higher the octane, the more resistant it is to burn. No fuel is cleaner than the other. Higher octane fuels are typically recommended for higher compression motors because the higher compression and higher rpm powerband creates a ton of heat in the combustion chamber. A lower octane fuel may ignite without the spark which is called detonation and is VERY bad for a motor. Luckily knock sensors will react quick enough to reduce damage in most cases. The result is reduced timing and additional fuel to cool the combustion chamber. The end result is reduced power and mpg.
In colder temps, the air charge is denser and the engine is often operating at a slightly lower temp therefore you can usually get away with running a lower octane and will probably not notice the difference. It is quite possible under certain conditions, 89 could out perform 91+. As temps get warmer, it becomes more ideal to run higher octanes. If you drive below 4000rpms almost all the time and don't lug the engine, then you can probably get away with running non-premium almost exclusively.
For all other 1st gen G35s, you can safely run regular and mid grade with no damage to the motor. MPGs and power may or may not suffer. It really depends on how you drive. Drive like a grandma in cold weather and you may see better mpgs. Drive like lunatic in warmer weather and the mpgs will suffer as well as power.
Octane is simply a measure of a fuel's resistance to burn. The higher the octane, the more resistant it is to burn. No fuel is cleaner than the other. Higher octane fuels are typically recommended for higher compression motors because the higher compression and higher rpm powerband creates a ton of heat in the combustion chamber. A lower octane fuel may ignite without the spark which is called detonation and is VERY bad for a motor. Luckily knock sensors will react quick enough to reduce damage in most cases. The result is reduced timing and additional fuel to cool the combustion chamber. The end result is reduced power and mpg.
In colder temps, the air charge is denser and the engine is often operating at a slightly lower temp therefore you can usually get away with running a lower octane and will probably not notice the difference. It is quite possible under certain conditions, 89 could out perform 91+. As temps get warmer, it becomes more ideal to run higher octanes. If you drive below 4000rpms almost all the time and don't lug the engine, then you can probably get away with running non-premium almost exclusively.
I only use Chevron and always Premium, even when my car was stock. Is it bad I don't even really look at the gas price when I'm filling up? As long as its not like $70 fill up, I don't really care 
. It is what it is.
. It is what it is.
E
And for all you Owner's Manual Holy Roller Fundementalists, the very same manual also says things like not riding with your hand out the window. I'm sure you'd never do that either. The manual also says you should ideally shift from 1st to 2nd at 8 mph. How often does that happen?
Anyway, I was just checking. Doesn't seem like anyone here has the nads to run regular, and just being another sheep in the flock I guess I won't either. Unfortunately my wife is the one who fuels up the G35X and she does not believe in premium gas. She thinks it all comes out of the same big tank. We'll have to see how long the engine in the X lasts.
And for all you Owner's Manual Holy Roller Fundementalists, the very same manual also says things like not riding with your hand out the window. I'm sure you'd never do that either. The manual also says you should ideally shift from 1st to 2nd at 8 mph. How often does that happen?
Anyway, I was just checking. Doesn't seem like anyone here has the nads to run regular, and just being another sheep in the flock I guess I won't either. Unfortunately my wife is the one who fuels up the G35X and she does not believe in premium gas. She thinks it all comes out of the same big tank. We'll have to see how long the engine in the X lasts.
Apparently the G35 coupe are tuned differently.
And who the hell rest their hand on their window? No wonder those window motors keep going bad or keep getting "loose". Our windows don't have frames like other cars do, so they tend to move around and things start to get loose pretty quick.
Also, can you explain why the manual clearly state NOT TO drive abruptly when on regular fuel and to replace with with Premium ASAP?
Last edited by jibberjabbers; Feb 25, 2011 at 05:18 PM.
Infiniti advised using 91+ octane so that complainers such as yourself would have something to complain and get worked up about. And because they were bored.
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The manual is sort of a guide that pretty much tells you "shouldn't" do something. For example, if they really say not to stick your arm out the window, that's because some people (like one of my father's good friends) have had their arm crushed in a freak accident when his hand was out the window and they're saying that to prevent it from happening to you.
But go ahead don't follow it. I'm sure you know a lot more about your engine than the engineers who build them do. It's not like it matters to me or any of us when your car prematurely decides to stop working.
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The manual is sort of a guide that pretty much tells you "shouldn't" do something. For example, if they really say not to stick your arm out the window, that's because some people (like one of my father's good friends) have had their arm crushed in a freak accident when his hand was out the window and they're saying that to prevent it from happening to you.
But go ahead don't follow it. I'm sure you know a lot more about your engine than the engineers who build them do. It's not like it matters to me or any of us when your car prematurely decides to stop working.
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Joined: Jan 2011
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From: Land O Lakes Ontario
Wow. I thought the quoted line was classic and I actually smirked. It was pointed and accurate.
As for the Big Question per the OP . . . . this morning for the first time I tried a full tank of midrange, just to see. The faqs here seem to make it clear that for relaxed driving we can definitely use a lower octane, and in these currently snow-covered roads, I am not exactly hot-rodding it.
As I understand it, the computer will protect against knock and you won't get top performance. I am waiting to see if I lose a significant amount of mileage.
As for the Big Question per the OP . . . . this morning for the first time I tried a full tank of midrange, just to see. The faqs here seem to make it clear that for relaxed driving we can definitely use a lower octane, and in these currently snow-covered roads, I am not exactly hot-rodding it.
As I understand it, the computer will protect against knock and you won't get top performance. I am waiting to see if I lose a significant amount of mileage.
strange, the sticker on my fuel door says "premium recommended for best performance" it does not mention required. either way, i live in phx and it gets hotter then **** in the summer so it will be premium for sure for me. i don't want my timing retarded by the ecu
edit to clarify: i have an 06 6MT with the rev-up motor
edit to clarify: i have an 06 6MT with the rev-up motor
In Arkansas I can seldom find 93, I generally use 91 (premium here). I've put regular in a couple times and honestly I didn't ever feel like the motor was going to blow up. You guys act like everyone drives 7k rpm through town. In reality most people who use these cars as DD's are probably putting much lower amounts of stress on the car than it can handle. If you constantly drive the car pretending to be a race car driver I could see the absolute need for 93. If you have the cash go for it, if your in a pinch regular won't kill your car.
Since we are in the middle of a debate. Does anyone know the true benefits of running non ethanol fuel versus the 10% ethanol blended fuel. I read that the non ethanol fuel is better but haven't found a definitive answer.
My thoughts exactly. I just drive the way I do and fill up when I need to. Knowing the price of gas isn't going to change anything.
Wow. I thought the quoted line was classic and I actually smirked. It was pointed and accurate.
As for the Big Question per the OP . . . . this morning for the first time I tried a full tank of midrange, just to see. The faqs here seem to make it clear that for relaxed driving we can definitely use a lower octane, and in these currently snow-covered roads, I am not exactly hot-rodding it.
As I understand it, the computer will protect against knock and you won't get top performance. I am waiting to see if I lose a significant amount of mileage.
As for the Big Question per the OP . . . . this morning for the first time I tried a full tank of midrange, just to see. The faqs here seem to make it clear that for relaxed driving we can definitely use a lower octane, and in these currently snow-covered roads, I am not exactly hot-rodding it.
As I understand it, the computer will protect against knock and you won't get top performance. I am waiting to see if I lose a significant amount of mileage.
Also, those sites or magazines that talks about using premium gas is a "waste of money", are referring to owners who run PREMIUM fuel on cars that don't require it, thinking they would get better MPG and what not.
Last edited by jibberjabbers; Feb 25, 2011 at 08:46 PM.
In Arkansas I can seldom find 93, I generally use 91 (premium here). I've put regular in a couple times and honestly I didn't ever feel like the motor was going to blow up. You guys act like everyone drives 7k rpm through town. In reality most people who use these cars as DD's are probably putting much lower amounts of stress on the car than it can handle. If you constantly drive the car pretending to be a race car driver I could see the absolute need for 93. If you have the cash go for it, if your in a pinch regular won't kill your car.
http://www.usatoday.com/money/autos/...emiumgas_x.htm
http://www.edmunds.com/fuel-economy/...d-premium.html
Using reg will really on decrease 0-60 but 1/2 second
Old but i still think most is true
http://www.edmunds.com/fuel-economy/...d-premium.html
Using reg will really on decrease 0-60 but 1/2 second
Old but i still think most is true