Shell V-Power Racing 100 octane with 5% Ethnol. Ok for G's?

[Andy_V35Sky_350GT]

Been looking at maybe starting to use Shell V-Power (100 RON) fuel but it says its blended with 5% Ethnol.

Now, I dunno much about enthol (ok, pretty much so nothing) but is it a good thing or a bad thing? I'd be using it to get more performance obviously, but also would be expecting extra mileage. Its an extra AU 20 cents a litre here (AU$1.46 a litre as apposed to AU$1.22 a litre for standard V-Power 98).

Would the extra $15 a tank REALLY be worth it? Does ethnol screw with VQ's?

[ArEs23x]

Please dont take what I am about to say into consideration because I have no idea, but its just more of a thought. What if heard before is that if you put premium gas to an unleaded car...your basically wasting your money because the extra octane wont do it good cuz the motor was built to run at unleaded and not at premium...so my question is...is puttin 100 octone really going to affect the gas mileage much because the car was made for 91 octane

okay that was just a thought..i could be wrong...but who knows...im sure someone will pop in here anytime...

[zozoka1212]

I loved it when I lived in Europe. I don't know if you can with the G because the computer adjusting to your fuel.

Just try it. You going to like it.

ArEs23xThe 91 in North America is different than in Aus or Euro. I beleive the 93 is equalls out to 98 there.

zozo

[Andy_V35Sky_350GT]

Pretty sure VQ's were designed for 96, at least thats what my Jap 350GT manual says, so not sure. I definately notice an increase in smoothness/power using 98 premium as apposed to standard 96 premium.

Also, not sure if USA fuel rating standards are different to AU's.

[ArEs23x]

I loved it when I lived in Europe. I don't know if you can with the G because the computer adjusting to your fuel.

Just try it. You going to like it.

ArEs23xThe 91 in North America is different than in Aus or Euro. I beleive the 93 is equalls out to 98 there.

zozo

AHHHHH!!! Didnt know it was different...well at least i learned something new today haha

[joe603]

The G35's tune of the VQ35 is designed for premium fuel. Premium is anything over 90 octane. If you go higher, the computer will adjust timing for the optimal tune.

The original question of 100 octane, with ethanol is a good question. I would think that it's really not worth the cost for day-to-day driving. Where you get into trouble with ethanol is the low octane versions of the blend.

We have a few gas scholars on the site that will probably chime in. (Q45 and Infinititech1)

[Q45tech]

RON octane number is much much much less important than the MON octane number, which is tested with hot air and a higher rpm than idle rpm were all the RON tests occur!

RON is worthless as a cruising knock indicator.

[redhed]

most of what i've read (including many owner's manuals) suggest that in a NON E85 vehicle...you can burn fuel that contains up to 10 percent ethanol.

now whether or not the G ecu can take advantage of 100 octane fuel is a question for someone else. you might try one tank of the stuff to see if you notice a difference.

[chad1200]

most of the gas stations i use in the metroplex have signs that say there's 10% ethanol in all of the grades.

[smockers83]

Essentially all gasoline these days is mixed with ethanol, usually 5%, at least in the States. If a station sells gasoline mixed with 10% or higher, they have to say so on the pump as some cars, such as the G, don't like gas with more than 10% ethanol. With a high compression engine such as the VQ35, you'll want the higher octane under hard driving, spirited driving, whatever you want to call it. The reason you feel more power with higher octane is because the engine isn't retarding the timing as it would if you used a lower octane. On an engine like the VQ with no electronic management and a carb, you would actually want the 100...with injectors and engine management you can lower this down to the 93 octane. With a higher octane, up to 100 say, the engine will achieve full compression at combustion, where as with regular you won't.

[TKLEI14]

WOW they dont even sell 100 near me