If I try the PC Ultra 94 one time, will I notice any difference? Or does the ECU need time to adjust?

Apparently Husky also has 94 octane gas (with ethanol).

For what it's worth, I've run Shell V-Power for the last 225,000 miles, no problems car still pulls good, and get the same mileage I always have. In the US when I've been out there with the car I do find I get better mileage with the gas in general. Also I run the highest octane available when I fill up in the US, I try to only fill up at Shell there also, but if I can't find one I try and stick with "good" brands.

The ethanol content if its < E10 is pretty negligible -- it more like any odd hiccups (random miss) might be attributed to it in the absence of a better explanation, but really its fine.

The 94 octane (assuming AKI rather than RON) is worth it if you are tuned and running a little more ignition advance or the car sees hot laps on the track -- otherwise, I doubt you'll find much of a difference in power either.

On the other hand, it certainly won't hurt -- what's the price difference compared to 91 and can you get 93?

I also use 94 but original was using shell 91. When I got the car tuned the guy said he would recommend the 94 "if it was him" he said. He explained there would be less engine knock and burn just that little bit hotter which is a good thing :tup:

I figured, you know what he knows more about that crap then me, after that I made the switch :tup:

Cooltoy - I have noticed at petro-can when you look at the grades of gas the 94 does not have any mention of ethanol on the label/sticker/sign for selecting grade. Where the lower grades are one big label/sticker/sign that covers all 3 grades and that sticker has the **may contain up to 10% ethanol. I think what ta-kid posted is correct no ethanol and the fuel is coming from a chevron refinery.

Taken from the Petro Canada FAQ

Link to the Petro Canada Ultra 94 FAQ

Petro-Canada Canada’s Gas Station Home Page - Petro-Points - Petro-Canada and CIBC MasterCard

Shell Canada V-Power NiTRO+ info,

Shell V-Power NiTRO+ - Canada

Shell Canada V-Power NiTRO+ FAQ,

Shell V-Power NiTRO+ FAQs - Canada

11. Is Shell V-Power NiTRO+ premium gasoline safe for all vehicles?
•Shell V-Power NiTRO+ is effective in all gasoline-powered engines found in conventional, modern and hybrid vehicles as well as motorcycles, snowmobiles, and leisure marine vehicles.
•Shell V-Power NiTRO+ premium gasoline in Canada does not contain ethanol.

So sounds like we're good in Canada with Shell V Power for no ethanol...other then what's left in the hose from the last person.

PetroCanada website says that it now has ethanol.

Gas in Canada
 

I don't recall the last time I bought gas in Canada,but I am headed to the U.S. for a few weeks soon so I'll try and do some gas research while I'm there. I've used Chevron exclusively forever but now I'm thinking about using Shell. My Chevron card doesn't give me any points but using my VISA for gas will. Bonus.

104

doing the reverse right now and i can't tell a difference from going from PC 94 to shell 91. have had about 2 tanks on 91. although my tank is a bit sloppy since i had some irving premium, no name mix and bunch of other mixed gases and some octane boost from my road trip. i should really burn that gas to 1/4 tank then fill'er. :shakes head:

we also have select esso offering 93 (haven't tried) as well.

few cents more for the 94 compared to 91 at PC but imho i wouldn't get the 91 at PC if they offer 94

yea i read that awhile ago that they have ethanol in it... up to 10% or somethign wonky.

now that i think about it i'm sort of thinking how that will store in the winter asorbing moisture and such. :eekdance:

:iagree:
At the end of the day, use whatever octane you like as long as it's premium being put into your Z. Now, if you're someone to complain about the difference in price per liter, why buy a sports car? :eekdance:

Gas price was the last thing on my mind last year buying my z.

Frankly, I'm more put off by the claim of "7 times the detergents" than I am by up to 10% of ethanol...

that and their admission of marketing hype...

"In addition, 20% of all Shell consumers buy premium, but 80% of these consumers believe all premiums are the same. We launched Shell V-Power NiTRO+ Premium Gasoline so we could address this growing consumer demand in the industry and differentiate Shell from other premiums."

Translation: We can nail a large share of premium petrol users if we slap a fancy name on our already fancy sounding "V power" formulation.

Anyway, either is probably fine, but the higher octane if the price/gal difference is small is probably the safer bet if you beat on your car or plan to do any tuning where you might nudge up the power, in part, by leaning out the mixture and/or raising the ignition timing.

There is no evidence of the ECU advancing timing beyond whatever its highest allowable value - BUT, the higher octane will help ensure you don't lose timing from incipient knock under heavy load. If you plan on doing tuning, I'd say go for max power and tune for the 94.

Nope, staying stock.

The problem I see with tuning for 94 is if you travel...you may not always find a good 94. I for one travel a LOT with my Z and kept it mostly stock-ish for that reason.