I have never personally owned a car that requires that you use premium fuel (I'm 18)

what exactly will it do to your g37 if you use the regular fuel instead? Premium is like 1$ more per gallon ...

also, i've heard that premium fuel gets better gas mileage? is that true?

 

where the hell do you live that premium is $1.00 more per gallon?

 

it probably feels like a dollar more, but in fact it's about 20 cents more.

premium gas does not give you a better gas milleage. what it gives you is more bang for the same amount of gas in your engine: results: better response on the acceleration

 

Some will say it matters, some say it doesn't. From my personal experience, the car runs like **** with regular gas.

 

It will only give you better gas mileage since the gas burns more efficiently than lower octane fuels, burns cooler. You should stick with Premium or at worst mid-grade IMO.

 

This is a very complex issues actually, but a boiled down single view goes something like this:

Higher octane translates to a cooler combustion (Flame) which allows you to run higher compression, which gives you the better performance.

lower octane may or may not seem to cause you noticeable problems, but you will run higher heat in the motor.

Another component of the fuel is oxygenation within the fuel (not the air intake) which provides a bigger combustion.

So more oxygen and more octane would give you a big bang that runs cooler than lower octane fuels.

Clear as mud right?

For longevity of the motor and better over all performance, run the good stuff.

 

Well said in such few sentences!! (provided it's correct)

Can someone sticky this?

 

Higher octane does not burn cooler. It does not burn hotter either. It does not get better or worse mileage.

Octane is a measurement of resistance to detonation. Nothing more. Higher octane fuels allow an engine to be tuned with higher compression ratios and/or more aggressive spark advance.

Some cars require premium and some recommend it. If it is merely recommended, you may use regular with no ill effects, though under full throttle acceleration you may notice reduced preformance as the knock sensors retard the ignition timing.

The G37S requires premium. The G37 recommends it. You can find this in the owners manual.

Oxygenation only effects the air/fuel ratio and all modern cars with O2 sensors and electronic ignition compensate for oxygen content. More oxygen does not provide more power, just lower MPG.

 

i think its been discussed b4. the avg. owner will only save a few hundred dollars from regular to premium. IF you own this car Premium. if leasing who gives a poop. your performance will suffer but what do u care its not your car. my car only get 91+ Nothing less unless im about to run out of gas and their is no premium options.

 

Why would this be the case? I didn't think there was a difference in the engine at all between the G37S and the G37. The S denotes either the 6MT version or a 5AT with the Sports package. The engine is the same in any trim. Or is it?

 

The 'S' has another 500 HP duh!

 

I stand corrected, and why should we all guess as the answer is right here:


http://en.wikipedia.org/wiki/Octane_..._octane_rating

 

You've been talking to Krazy too much.

 

There must be a difference in the ignition mapping, since the engines are identical mechanically.

 

^^makes sense...