Yes, he was just making sure everyone else was able to make an apples to apples comparision. Hence the "For anyone wondering".

 

Oh wow... I didn't know that. Good catch, Epiphany. The more you know, eh?

It's fair to say 99.9% of the members on this forum are in North America, so in that context whatever system "most of the world" uses is certainly a valid point, but kind of irrelevant. You know what is even more irrelevant? It's when you have a choice, and then intentionally put gasoline in your car rated at higher octane levels than the engine is designed for.

 

91 Shell V-Power..if i run anything else car pings sometimes

 

I've been wondering this. All I've been using is shell v power for year and half from same gas station but now that we have a famine on gas on what not in Georgia I tried Exxon this time. Not sure I can tell a difference between the 2. I guess I should quit being a shell fan boy lol

 

If you're considering getting tuned, and fill with 93 before the tune, can the tuner "get more" out of the engine than he could if you were running 91? Should you then run 93 to run optimally, or is that not how any of this works?

 

93 only since my gas is paid for by my company!

 

On the subject of gas. Here in Michigan up until about 3 months ago there was usually 20 cents difference between reg., mid (87) , and prem.(93). So prem was .40 more then regular. Now there is a bigger difference. usually .30 between the grades. One station had prem. at .70 more a gallon. $2.20 vs 2.90. Anyone else seeing these increases?

 

Yeah here in TN it really depends on the station .50- .60 from 87 octane to 93 octane though I got some 93 octane at Sams Club for $2.28 while regular was $2.02.

 

BP and Exxon are always cheaper whenever I fill up too. I filled up from BP for $1.93/gal... For 93 octane

 

Depends on whether gas is going up or down. Premium usually goes up first and goes down slower because if a gas station has to buy a tanker full of 93 when the market is at a peak, it takes longer for them to sell off the expensive gas they are sitting on.

Some of it is just gouging, however. Stations that only display the price of regular roadside usually charge a larger amount for premium, which kinda strikes me as almost a bait and switch. Before I had a job where a gas card was a perk, I knew all the stations that would gouge on premium and avoid them. Now I don't care so much because it's OPM.

 

In the DC-Metro area, the difference between 87 and 93 has always been about 70-80 cents (for as long as I've been driving).

 

We pump 93 Octane from Top Tier gasoline, preferably Chevron because of its Techron additive.
No pinging or other issues. Car works great, and responds quickly when I step on it.

 

That's interesting. I feel the exact opposite with my car. It feels like the gas lasts longer when I put in 93 Shell V-Power.

 

Shell 91 V-Power

 

I use exactly what the G37 Owner's Manual indicates on page 9-4:

"Use unleaded premium gasoline with an octane rating of at least 91 AKI (Anti-Knock Index) number (Research octane number 96).

If premium gasoline is not available, unleaded regular gasoline with an octane rating of 87 AKI number (Research octane number 91) may be temporarily used, but only under the following precautions:

. Have the fuel tank filled only partially with unleaded regular gasoline, and fill up with unleaded premium gasoline as soon as possible.

. Avoid full throttle driving and abrupt acceleration.

Use unleaded premium gasoline for maximum vehicle performance."

Usually, I fill up at Esso.

It's interesting to note that the similar instructions for the 3.7L Nissan Maxima (290 hp vs. 328 hp for the G37) state that using 87 octane gasoline is acceptable but the performance of the engine may decrease somewhat. Perhaps the VQ37VHR engine on the G37 has a slightly higher compression ratio than the one on the Maxima, or some other fine tuning was done on it to achieve the extra horsepower.