I know we're reccomended to put Premium in our cars, but read this article. Maybe I'll just put in premium before I head to the track.....


http://www.usatoday.com/money/autos/...emiumgas_x.htm

 

I know if I were leasing my car, I'd only put regular in it (not even bother with the mid-grade 89 stuff).

BTW - are you the same "hayaku" on the Roadfly M3 board?

 

Yes, this is not news though. I'm pretty sure it's pretty commonly known among car guys that higher octane does not mean it's any better. I'm not going to start again on what octane means etc etc etc.

BUt just take it for that. Put whatever it sayas to put in your manual

 

The manual will say to use the highest gas possible, so you can get better performance. Lower octane fuel will not have ill effects on todays engines. The car's computer will prevent knocking.

Hooman

 

The article does say, though, that there is a loss of power. Here's the quote:
Also, the difference between 89 and 91 octane is usually about $.10, so with our 16(?) gallon tank, you're talking about $1.60 difference per tank. I spend more than that on a cup of coffee at Starbucks! So, for me, I'll spend the extra $1.60 to get the gas that is recommended in the manual.
(As far as 87 octane goes, I'd never put that in my car)

 

this article is aimed at people with Toyota Camry's or Honda Accord's that are putting in premium. For them it will do nothing.

Hooman

 

I've always followed the manufacturer's recommendations.
When he says regular, I run regular until it pings. Then I up the grade until it doesn't ping.
When he says premium, I run premium, and am happy to do so, and won't sacrifice power in favour of cheaper fuel.

C.

 

This issue has been discussed ad nauseum and I believe we are all aware of the advantages of a higher octaine gas. Most of us are looking for ways to improve our engine's performance, not degrade it to save around $100 a year in fuel costs. One thing the article doesn't point out is that many companies put their best detergents in their premium fuel. One example is Shell with their V Power.

 

Why would you buy a high performance car and lessen the performance by putting in a substandard grade of fuel. This forum is full of performance upgrades that ofer very little performance gain for alot of money. So put regular in your car and lose 5% (15 hp) are you stupid?

 

"Engines designed for regular fuel don't improve on premium and sometimes run worse. And today's engines designed for premium run fine on regular, too, their makers say, though power declines slightly."

That about sums it up.

 

Don't be that guy. If you are worried about saving a very minimal amount each year on your gas then you shouldn't be driving G

 

my mom put in Plus in her g35x for a while (middle grade)... and im pretty sure that our premium is 93 octane here.. and then 89 and 87 respectivly for the two lower grades. he car would shift more jerkily (5at) and she noticed the difference and thought something was wrong with her car for a while until she switched back to premium and it was fine... my sister noticed similar things in her old is300 when she switched to 89 octane.... If two WOMEN (nothing against them... i love them and everything) can notice the car driving differently on different octanes, then i definatly dont really wanna try in my G.... especially since im going to be driving this car for a LONG time.

 

I also always put 93 in. I've heard a real life story though, that a 2001 Pathfinder was shaking wan idling, and putting 87 octane solved the problem and made it run nice and smooth again.
I might put 89 in once a year just to see the difference and maybe smooth things out, and let the engine appreciate the 93.

 

Amen!

 

i agree at most your saving $5 on each fill, between 87-94 octane.




not worth it ...